JPS6337214A - Light-receiving device for optical fiber encoder - Google Patents

Abstract

PURPOSE:To improve the performance and to reduce the cost of manufacture, by providing a fixing plate in which the end parts of optical fibers in a plurality of sets held in an optical fiber holding body are inserted and fixed, and a lens plate which is disposed in a position opposite to these fibers and constructed integrally with a plurality of lens. CONSTITUTION:Incident light transmitted through a forward optical fiber 10a of an optical fiber cable 2 from a light-receiving element passes through a lens 16 of a lens plate 14 corresponding thereto and enters a slit 21 of a fixed slit plate 20. A rotary reflecting plate 24 having reflecting parts 22 formed on its reflecting surface by slit holes rotates in a prescribed direction with the rotation of a shaft 27, and when the reflecting part 22 becomes synchronous with any of the slits 21, the light is reflected by the reflecting part 22 of the reflecting plate 24. Thereafter, it passes again through the slit 21 and the lens 16, enters a backward fiber 10b and is received by the light-receiving element through the cable 2 of an optical fiber holding body (a).

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a light receiving device for an optical fiber encoder, and in other words, it relates to an improvement of a light receiving device in a light detection section of a reflective optical fiber encoder.

(Prior Art) Optical fiber encoders are originally employed in robots, machine tools, etc., and are used for positioning, angle measurement, etc. Particularly in noisy environments, this type of encoder is used as a way to reduce noise. However, since optical fiber encoders use optical fibers, the light intensity they receive and transmit is weaker than that of optical encoders, so it is difficult to utilize the optical power in the optical fibers sufficiently efficiently. was necessary.

There are two types of optical fiber/to encoders: a light transmission type and a light reflection type, and both are required to efficiently receive optical signals. Therefore, in order to utilize optical power efficiently, a configuration in which SELFOC lenses or spherical lenses are individually arranged at the end of an optical fiber for each of multiple phases, for example, A phase, B phase, and Z phase, has been proposed. We are hiring.

(Problems to be Solved by the Invention) However, since the slits provided in the fixed plate and rotary plate of the conventional optical fiber encoder mentioned above are small,
The accuracy of these setting positions is very strict, and in a configuration in which optical signals are processed separately using related components for each phase, the important elements of the related components are optical fibers and lens optics. In order to maintain accurate positioning and accuracy of the system, complicated machining must be performed, and maintaining accuracy requires advanced technology, resulting in high costs.

(Means and effects for solving the problems) In view of the above-mentioned problems, the present invention has a structure in which the light receiving section, which optically detects signals individually for each phase as in the conventional example, is integrated. I will provide a.

This makes it possible to easily manufacture a high-performance light receiving section.

That is, a lens plate integrally configured with a fixing plate into which ends of a plurality of sets of optical fibers housed in an optical fiber holder are fitted and fixed, and a plurality of lenses disposed at positions facing the plurality of sets of optical fibers. It provides a configuration with It helps to improve.

(Example) Examples according to the present invention will be described below based on the accompanying drawings. FIG. 1 is a route diagram of a reflective optical fiber encoder incorporating the light receiving device of the present invention. optical fiber cable 2,
A rubber bush 4, a Kevlar ring 6 for locking a tension-resistant material such as Kevlar attached to the outer periphery of the optical fiber 10.
An optical fiber fixing plate 12 in which the ends of a plurality of sets of optical fibers 10 are inserted and fixed is attached to one end of an optical fiber holder a equipped with a Kevlar retaining ring 8 and the like. Note that the optical fibers 10 include a pair of outbound fiber 10a and a pair of return fiber 1, respectively.
0b. A lens plate 14 is provided adjacent to the fixing plate 12 and integrally formed with lens groups 16 provided so as to face the optical fibers 10 fitted and fixed to the fixing plate 12, respectively. The lens plate 14 faces the fixed plate 12 with an appropriate gap therebetween via a connecting member 18 to the optical fiber holder a.

A fixed slit 2o is provided close to the lens plate 14, and a 5-turn slit 22 is further carved in parallel with the fixed slit 2o to form a reflective surface 23 (
A rotary reflector 24 with a rotary reflector 24 (FIG. 3) is attached to a rotatable shaft 27. The rotating reflector 24 is rotatable together with the shaft 27 via a bearing 26.

Incident light from a light receiving element (not shown) passes through the outgoing optical fiber lOa of the optical fiber cable 2, passes through the corresponding lenses 16 of the lens plate 14, and enters the fixed slit 20. When the rotating slit 22 rotates in a predetermined direction with the rotation of the shaft 27 of the rotating reflecting plate 24, when the rotating slit 22 is synchronized with the rotating slit 22, the reflecting surface 23 of the rotating reflecting plate 24 rotates once.
The reflected light passes through the fixed lens 20, the lens 16, the return fiber 10b, the optical fiber cable 2 of the optical fiber holder a, and is received by a light receiving element (not shown). FIG. 3 shows the configuration of the rotating reflector 24 employed in the light receiving device of the present invention. On a mirror surface having a reflective surface 23, a non-reflective material 30 in which a slit hole 28 for a rotation slit is carved is pasted. A slit-shaped reflective surface 23 having the same shape as the slit hole 28 is formed in a portion where the slit hole 28 is located. The reflecting surface of this rotary reflecting plate can be manufactured through a simple process, and there is no need to perform complicated work such as depositing metal on a mirror glass plate and hot etching it as in the conventional example.

(Effects) In the present invention, by employing an optical fiber fixing plate and a lens plate configured to maintain accurate positioning and high precision of multiple sets of optical fibers and the lens optical system facing them, This contributes to improving the performance of the reflective optical fiber encoder, and by integrating the light receiving section, the structure of the rotary reflector can be simplified, steps in the manufacturing process can be omitted, and manufacturing costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a side view of a reflective optical fiber encoder incorporating the light receiving device of the present invention. Figure 2 is a partially enlarged view of Figure 1. Figure 3 is an exploded perspective view of the rotating reflector. a... Optical fiber holder, 10... Optical fiber, 1
2... Optical fiber fixing plate, 14... Lens plate, 16
...Lens, 20...Fixed slit, 22...Rotating slit, 23...Reflecting surface, 24...Rotating reflector, 28...Slit hole, 30...Non-reflective Nobuto Murayama Delphi Co., Ltd. Agent Patent Attorney Ko
Sakae Hayashi Figure 1 f 10 - Optical fiber 12 - Fixed plate 14 - Lens plate 16 - Lens 20 - Fixed slit 22 - Rotating slit 24 - Rotating reflector 0 Optical fiber holder Fig. 2 Fig. 3 23...-Reflecting surface 24...Rotating reflecting plate 28...Slit hole 30...Non-reflective material procedural amendment May 29, 1988 1, Indication of the case 1986 Patent Application No. 180686 2, Title of the invention Optical fiber encoder light receiving device 3, Person making the amendment Relationship to the case Patent applicant Murafu Tokyo-Mi No-chome 17-1 No. 4 , Agent 〒160 Name (7510) Patent Attorney Sakae Kobayashi -'. 8. Contents of the amendment As shown in the attached sheet (1) The scope of the claims will be amended as follows. [1. In an optical fiber encoder equipped with a fixed slitting plate with a LL top and a rotating reflector provided to face it, the ends of a plurality of sets of optical fibers housed in an optical fiber holder are 1. A light receiving device for an optical fiber encoder, comprising a fixing plate that is inserted and fixed, and a lens plate integrally formed with a plurality of lenses formed at positions facing the plurality of sets of optical fibers. 2. Glue a non-reflective material with slit holes on the reflective surface of the mirror so that the slit holes form a reflective part.
is! ! 1. A light receiving device for an optical fiber encoder according to claim 1, which has J1. (2) Pages 5, 6, and 7 are amended as follows. A lens plate 14 is provided which is integrally formed with a lens group 16 provided to face each optical fiber 0.The lens plate 14 is fixed to a fixed plate by a connecting member 18 so as to face each other while maintaining an appropriate gap. A plurality of slits 21 are provided in the fixed slit plate 2o close to the lens plate 14, and a reflective surface 23 (third
shaft 27 that can freely rotate the rotary reflector &24
Attach to. The rotating reflector 24 is rotatable together with the shaft 27 via a bearing 26. The incident light from the light receiving terminal (not shown) passes through the outgoing optical fiber 10a of the optical fiber cable 2, passes through the corresponding lenses 16 of the lens plate 14, and passes through the fixed slit plate 2o.
into the slit 21 of. A rotary reflecting plate 2 having a reflecting part 22 formed on a reflecting surface 23 by a slit hole 28 which will be described later.
4 rotates in a predetermined direction as the shaft 27 rotates,
Reflector 22 and multiple slits 21 of fixed slit plate 2o
When synchronized with any of the above, the light is reflected by the reflection part 22 of the rotating reflection plate 24 and then reflected again by the slit of the fixed slit plate 2o).
21, the light passes through the lens 16, enters the return fiber 10b, passes through the optical fiber cable 2 of the optical fiber holder a, and is received by a light receiving element (not shown). FIG. 3 shows the configuration of the rotating reflector 24 employed in the light receiving device of the present invention. A rotating reflecting plate 2 is placed on a mirror surface having a reflecting surface 23.
A non-reflective material 30 having slit holes 28 for forming reflective portions 22 of No. 4 is glued together. A reflective portion 22 having the same shape as the slit hole 28 is formed in the portion where the slit hole 28 is provided. The reflecting portion of this rotary reflecting plate can be manufactured through a simple process, and there is no need to perform complicated work such as depositing metal on a mirror glass plate and hot etching it as in the conventional example. (Effects) In the present invention, by employing an optical fiber fixing plate and a lens plate, which are configured to maintain accurate positioning and high precision of multiple sets of optical fibers and the lens optical system facing them, reflection is achieved. In addition to contributing to improving the performance of type optical fiber encoders, the structure of the rotating reflector plate is simplified by integrating the reflector, the light receiver, and the light receiver, and steps in the manufacturing process are omitted, reducing manufacturing costs. . 4. Brief Description of the Drawings FIG. 1 is a side view of a reflective optical fiber encoder incorporating the light receiving device of the present invention. Figure 2 is a partially enlarged view of Figure 1. FIG. 3 is an exploded perspective view of the rotating reflector. a... Optical fiber holder, 10... Optical fiber, 1
2... Fixed plate, 14... Lens plate, 16... Lens group, 20... Fixed slit plate, 21... Slit, 22... Reflective part, 23... Reflective surface, 24 ...Rotating reflector, 28...Slit hole, 30...For non-reflective material Applicant: Delphi Co., Ltd. Patent attorney Sakae Kobayashi" Figures 1 and 6 10...--Optical fiber 12 ---Fixed plate 14 --- Lens plate 16 --- Lens group 20 --- Fixed slit plate 21 , , Slit 22 --- Reflector 24...9 rotation reflector a, -6 optical fiber holder

Claims (1)

[Claims] 1. In an optical fiber encoder equipped with a fixed slit and a rotating slit facing the fixed slit, the ends of a plurality of sets of optical fibers housed in an optical fiber holder are inserted and fixed. A light-receiving device for an optical fiber encoder, comprising: a fixing plate; and a lens plate integrally formed with a plurality of lenses formed at positions facing the plurality of sets of optical fibers. 2. The light-receiving device for an optical fiber encoder according to claim 1, comprising a rotating plate in which a non-reflective material having slit holes is pasted onto a mirror-surfaced reflecting plate so that the slit holes form a reflecting surface.