Hoya Corporation (Tokyo, JP)
What is a Patent for Method of manufacturing an electronic disk made of glass material, method for creating a magnetic disk glass substrate
Search Patent for Method of manufacturing an electronic disk made of glass material, method for creating a magnetic disk glass substrate
In light of the previous, in order to improve flatness of disk-shape glass material after being formed in the press the inventor has researched methods that include “dropping process to drop a lump of hot glass, and pressing process for making sheets of glass by sandwiching simultaneously the lump from both sides of the dropping path of the lump, using surfaces of the pair of dies that are facing each other, and performing press forming to the lump”. The using a mold release agent is not required and the flatness may be improved because the temperature difference is unlikely to be experienced between the two sets of dies.
But, as the research of the inventor the matter, it becomes evident that a made disk-shaped glass material is the shape of a disk whose length in the direction of the drop’s axial direction is more than lengths in the opposite directions. To make use of this unusual glass to serve as a substrate to make magnetic disks a process known as Scribing Process is needed. It involves cutting the substrate, which has cracks that grow from one side of the principal surface. The glass substrate is then machined to form a disk. Since the residual stress that is in-plane for irregular glass is not uniform, crack formation is difficult during the scribing process. Then, problems occur that chips are created at the outer circumference of thedisk-shaped glass substrate and the yield rate is remarkably reduced. So, when making a disk-shaped glass material using this method It is required that the glass material be substantially complete round.
Furthermore, making the glass material almost complete reduces the allowance for machining to shape and also reduces material waste. This can result in a reduction in costs.
The outer circumference of a disc-shaped glass material does not require machine work when it has a radius of 10.mu.m. In this case, elution (alkali elution for example) of the glass part from the outercircumference part may be slowed.
On the other hand it is now clear that, when cutting glass molten with cutting blades to release an unmolten lump of glass, a cut may remain in the sheet glass as well as the cut can remain as a defect of the machinedglass substrate for magnetic disk. This issue is clearly shown. It is possible to ameliorate the situation by decreasing the viscosity in glass during the process of press-forming. It is possible to lower the pressure on the press by decreasing theviscosity. This will allow for easier machining and higher efficiency.
However, it has become obvious that when the viscosity of glass diminishes, the “shape of which length in the axial direction of drop is greater than lengths in other directions” is now quite remarkable.
The invention described hereinafter offers a method for efficiently creating a glass substrate to create magnetic disks that are extremely smooth.
To solve the above issue, manufacturing of a glass substrate for magnetic disk according to the invention described herein is a process for the manufacturing of a glass surface for magnetic disk that includes a pair of principal surfaces, and the method comprises the steps of: dropping process for dropping the lump of molten glass press process for making sheets of glass by sandwiching the lump on each side of the dropping path of the lump by putting the surfaces of the pair ofdies facing each other, and then making a press-formed lump; and machining process for machining the sheet glass material wherein the press forming is able to sandwich the lump while moving the two dies towards the direction of drop of the lump so thatrelative speed of the lump to that of the dies in the pair is near zero.
The preferred speed of the lump and the pair of dies is negative in terms of the velocity component in the direction in which the lump is falling.
It is recommended that the dies’ temperatures are less than the strain point of the glass.
Preferably, the glass contains, as converted based on the oxide, denoted as molar percentages: 50 to 75% SiO.sub.2, 1 to 15% Al.sub.2O.sub.3, totally 5 to 35% at lease one component selected from the group of Li.sub.2O, Na.sub.2O, and K.sub.2O,totally 0 to 20% at lease one component selected from the group of MgO, CaO, SrO, BaO, and ZnO, and totally 0 to 10% at lease one component selected from the group of ZrO.sub.2, TiO.sub.2, La.sub.2O.sub.3, Y.sub.2O.sub.3, Ta.sub.2O.sub.5,Nb.sub.2O.sub.5, and HfO.sub.2.
Viscosity should be between 500 and 1,050 poise.
Preferably, the machining process comprises grinding process to grind the principal surfaces by using Abrasive grains fixed in place, and polishing process for polishing the primary surfaces using loose abrasive grains following the grinding process.
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There are many kinds of patents, and understanding the different types is crucial to protect your invention. Utility patents are for the development of new methods and machines. Design patents cover ornamental designs. Utility patents are best to protect the proprietor from copycats and other competitors. Most often, utility patents are issued for modifications or improvements on existing inventions. Utility patents also cover enhancements and modifications to existing inventions. For example, a procedure patent will be able to cover actions or methods for performing an action, while chemical compositions will comprise a mixture of ingredients.
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The first step in getting the patent you want is to perform a patent search. You can do a google patent search or do a USPTO search. Patent-pending is the name used to describe the product that has been covered by the patent application. It is possible to search the public pair to find the patent application. After the patent office has approved the application, you can do a patent number search to locate the patent issued which means that your product is now patented. Alongside the USPTO search engine, you can also utilize other search engines like espacenet, which is described below. It is possible to seek help from a patent attorney or patent attorney. Patents granted in the United States are granted by the US trademark and patent office as well as the United States patent office. The trademark office also evaluates trademark applications.
Are you interested in finding similar patents? These are the steps to follow:
1. Create a list of terms for your invention according to its function and composition or usage.
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Use the questions below to help you find the keywords or concepts.
- What is the objective of the invention Is it a utilitarian device or an ornamental design?
- Is inventing a method to make something or carry out an action? Or is it a product or process?
- What is the composition of the invention? What is the physical composition of the invention?
- What is the goal of the invention
- What are the technical terms and keywords that describe the characteristics of an invention? A technical dictionary can help you identify the correct terms.
2. Use these terms to find pertinent Cooperative Patent Classifications for your invention at the Classification Text Search Tool. To determine the most suitable classification to your invention, go through the classification’s class Schemes (class schedules). Consider substituting the words you’re using to describe your invention if you fail to find any results in the Classification Text Search with synonyms such as the terms you used in Step 1.
3. Go through 3. Check the CPC Classification Definition for confirmation of the CPC classification you found. If the classification you have selected includes a blue box that contains “D”, then the link to the CPC classification definition will be given. CPC classification definitions can be used to identify the specific classification’s scope, so you are certain to pick the most relevant. These definitions may also include research tips or other suggestions that could be helpful for further research.
4. The Patents Full-Text Database and the Image Database allow you to retrieve patent documents that include the CPC classification. You can look through and find the most relevant patent publications making a focus on abstract and drawings representative of.
5. This list of patent publication is the most appropriate to check for similarities with your invention. Take note of the specifications and claims. Refer to the applicant and patent examiner for any additional patents.
6. You can retrieve patent applications published in the past that match the CPC classification you picked in Step 3. It is possible to use the same search strategy in Step 4 to narrow your search results to the most pertinent patent applications through the abstract and illustrations on every page. Then, you must carefully review the patent applications that have been published and pay particular attention to the claims and additional drawings.
7. Find other US patent publications by keyword searching in PatFT or AppFT databases, classification search of non-U.S. patents in the below, and searching for non-patent publications of inventions with web search engines. For example:
- Add keywords to your search. Keyword searches may turn up documents that are not well-categorized or have missed classifications during Step 2. For example, US patent examiners often supplement their classification searches with keyword searches. Think about the use of technical engineering terminology rather than everyday words.
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- European Patent Office (EPO) provides esp@cenet to access a network of Europe’s patent databases with access to machine translation of European patents.
- Japan Patent Office (JPO) – with access to machine translations of Japanese patents.
- World Intellectual Property Organization (WIPO) offers PATENTSCOPE with a full-text search of published international patent applications and machine translations for some documents, as well as a list of international patent databases.
- Korean Intellectual Property Rights Information Service (KIPRIS)
- State Intellectual Property Office (SIPO) with machine translation of Chinese patents.
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- Search non-patent literature. Inventions can be made public in many non-patent publications. It is recommended that you search journals, books, websites, technical catalogs, conference proceedings, and other print and electronic publications.
To review your search, you can hire a registered patent attorney to assist. A preliminary search will help one better prepare to talk about their invention and other related inventions with a professional patent attorney. In addition, the attorney will not spend too much time or money on patenting basics.