GB555675A - Improvements in needles or reproducing points for use with gramophone tracks or the like - Google Patents
Improvements in needles or reproducing points for use with gramophone tracks or the likeInfo
- Publication number
- GB555675A GB555675A GB378842A GB378842A GB555675A GB 555675 A GB555675 A GB 555675A GB 378842 A GB378842 A GB 378842A GB 378842 A GB378842 A GB 378842A GB 555675 A GB555675 A GB 555675A
- Authority
- GB
- United Kingdom
- Prior art keywords
- grinding
- gramophone
- needle
- edges
- shape
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B3/00—Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
Landscapes
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Abstract
555,675. Gramophone needles ; grinding. VOIGHT, P. G. A. H. March 21, 1942, No. 3788. [Class 40 (ii)] [Also in Group XXIII] The point of a sound-reproducing gramophone needle is made of the shape of an inverted pyramid with rounded contacting edges as shown by the thick lines of the cross-sections shown. The section of the pyramid may be a square but is preferably a rhombus as shown. The two pairs of edges may be rounded as shown, in which case the needle may be turned to make use of either of these pairs of edges as contacting edges against' the side of the record grooves. The needle may be manufactured by first grinding four faces to the shape of a pyramid, then rounding and-polishing. If the material has a crystalline structure having different hardness in different directions, the first grinding may be a conical one, which due to the different hardness in different directions would produce a distorted cone. The 'distortion could then be increased by further localized grinding. Another possible procedure is to grind the working outline first and then round off and shape the other parts of the surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB378842A GB555675A (en) | 1942-03-21 | 1942-03-21 | Improvements in needles or reproducing points for use with gramophone tracks or the like |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB378842A GB555675A (en) | 1942-03-21 | 1942-03-21 | Improvements in needles or reproducing points for use with gramophone tracks or the like |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB555675A true GB555675A (en) | 1943-09-02 |
Family
ID=9764921
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB378842A Expired GB555675A (en) | 1942-03-21 | 1942-03-21 | Improvements in needles or reproducing points for use with gramophone tracks or the like |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB555675A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4105212A (en) * | 1975-09-23 | 1978-08-08 | Ogura Jewel Industry Co., Ltd. | Reproducing stylus for phonograph records |
| EP0020843A1 (en) * | 1979-06-22 | 1981-01-07 | Diamond S.A. | Pick-up stylus for gramophone |
-
1942
- 1942-03-21 GB GB378842A patent/GB555675A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4105212A (en) * | 1975-09-23 | 1978-08-08 | Ogura Jewel Industry Co., Ltd. | Reproducing stylus for phonograph records |
| EP0020843A1 (en) * | 1979-06-22 | 1981-01-07 | Diamond S.A. | Pick-up stylus for gramophone |
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