JPS57152570A - Recording disk detecting device - Google Patents
Recording disk detecting deviceInfo
- Publication number
- JPS57152570A JPS57152570A JP3849981A JP3849981A JPS57152570A JP S57152570 A JPS57152570 A JP S57152570A JP 3849981 A JP3849981 A JP 3849981A JP 3849981 A JP3849981 A JP 3849981A JP S57152570 A JPS57152570 A JP S57152570A
- Authority
- JP
- Japan
- Prior art keywords
- disk
- recording disk
- recording
- light
- output
- 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.)
- Pending
Links
Landscapes
- Optical Recording Or Reproduction (AREA)
Abstract
PURPOSE: To quickly detect the presence or absence of the recording disk with the output of a photodetecting means, by irradiating a light for detecting the recording disk upon a surface on which the recording disk is to be placed.
CONSTITUTION: A pair of a light emitting element 4 and a photodetecting element 5 are provided separately from a pickup 3, and a light is irradiated upon a placing surface 2 of a recording disk 1 from the light emitting element 4. When the disk 1 is placed on the surface 2, almost of the irradiated light is reflected by the recording plane of the disk 1 and goes into the photodetecting element 5. The output of the photodetecting element 5 is compared 6 with a reference level E1. The output becomes high level when the disk 1 is placed on the surface 2, and becomes low level when the disk 1 does not exist on the surface 2. Moreover, it is also possible to detect the surface and back sides of the disk by using a disk whose surface and back have different reflection factors and two series of comparators having different reference levels.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3849981A JPS57152570A (en) | 1981-03-17 | 1981-03-17 | Recording disk detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3849981A JPS57152570A (en) | 1981-03-17 | 1981-03-17 | Recording disk detecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57152570A true JPS57152570A (en) | 1982-09-20 |
Family
ID=12526946
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3849981A Pending JPS57152570A (en) | 1981-03-17 | 1981-03-17 | Recording disk detecting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57152570A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5972676A (en) * | 1982-10-18 | 1984-04-24 | Matsushita Electric Ind Co Ltd | Disc recorder and reproducer |
| JPS60123763U (en) * | 1984-01-30 | 1985-08-21 | パイオニア株式会社 | Recorded information reproducing device |
| JPS6116757U (en) * | 1984-07-04 | 1986-01-31 | 富士通テン株式会社 | Optical disc playback device |
| JPH0323814U (en) * | 1989-07-19 | 1991-03-12 | ||
| US5119356A (en) * | 1987-08-11 | 1992-06-02 | Canon Kabushiki Kaisha | Information recording and reproducing apparatus including detection of whether an information recording medium has been normally loaded into the apparatus |
-
1981
- 1981-03-17 JP JP3849981A patent/JPS57152570A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5972676A (en) * | 1982-10-18 | 1984-04-24 | Matsushita Electric Ind Co Ltd | Disc recorder and reproducer |
| JPS60123763U (en) * | 1984-01-30 | 1985-08-21 | パイオニア株式会社 | Recorded information reproducing device |
| JPS642265Y2 (en) * | 1984-01-30 | 1989-01-19 | ||
| JPS6116757U (en) * | 1984-07-04 | 1986-01-31 | 富士通テン株式会社 | Optical disc playback device |
| JPH0325341Y2 (en) * | 1984-07-04 | 1991-05-31 | ||
| US5119356A (en) * | 1987-08-11 | 1992-06-02 | Canon Kabushiki Kaisha | Information recording and reproducing apparatus including detection of whether an information recording medium has been normally loaded into the apparatus |
| JPH0323814U (en) * | 1989-07-19 | 1991-03-12 |
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