JPS556239A - Rotation detector for tachometer - Google Patents
Rotation detector for tachometerInfo
- Publication number
- JPS556239A JPS556239A JP7843278A JP7843278A JPS556239A JP S556239 A JPS556239 A JP S556239A JP 7843278 A JP7843278 A JP 7843278A JP 7843278 A JP7843278 A JP 7843278A JP S556239 A JPS556239 A JP S556239A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- light
- vicinity
- detection
- light source
- 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
- Linear Or Angular Velocity Measurement And Their Indicating Devices (AREA)
- Optical Transform (AREA)
Abstract
PURPOSE: To increase the reception of a projected light thereby to make it possible to effect the detection in high sensisivity by arranging the light emitting side of a light source and the receiving side of a photoelectric converter at or in the vicinity of the focal point of a lens.
CONSTITUTION: For instance, both a light source 11 and a photoelectric convertor 12 are arranged either in the vicinity of the focal point F of a lens 13 or in the vicinity of the center axis of the lens 13. The light emanating from the light source 11 is changed by the lens 13 into a parallel beam toward a rotary member to be measured. The reflected light, especially, most of the directly reflected light is condensed again through the lens 13 so that it reaches the receiving side of the converter 12. Since, in this way, the axes of projection and reflection are aligned according to that construction, the percentage of detection of the directly reflected light which is condensed by the lens 13 can be remarkably increased. As a result, the quantity of the received light is increased in comparison with the projected light so that the detection of high sensitivity can be performed.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7843278A JPS556239A (en) | 1978-06-28 | 1978-06-28 | Rotation detector for tachometer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7843278A JPS556239A (en) | 1978-06-28 | 1978-06-28 | Rotation detector for tachometer |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS556239A true JPS556239A (en) | 1980-01-17 |
Family
ID=13661870
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7843278A Pending JPS556239A (en) | 1978-06-28 | 1978-06-28 | Rotation detector for tachometer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS556239A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS629115U (en) * | 1985-06-29 | 1987-01-20 | ||
JPS6230115U (en) * | 1985-08-07 | 1987-02-23 | ||
JPS6284710U (en) * | 1985-11-16 | 1987-05-29 | ||
JPH01216212A (en) * | 1988-02-24 | 1989-08-30 | Sony Corp | Reflection type optical sensor |
-
1978
- 1978-06-28 JP JP7843278A patent/JPS556239A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS629115U (en) * | 1985-06-29 | 1987-01-20 | ||
JPS6230115U (en) * | 1985-08-07 | 1987-02-23 | ||
JPS6284710U (en) * | 1985-11-16 | 1987-05-29 | ||
JPH01216212A (en) * | 1988-02-24 | 1989-08-30 | Sony Corp | Reflection type optical sensor |
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