JPS59193435A - Mark detecting device - Google Patents

Abstract

PURPOSE:To detect exactly a mark by constituting so that the tip part of an optical fiber holds an attitude roughly vertical to a plane of a mark supporting body. CONSTITUTION:A titled device is provided with reels 12, 13 for winding a microfilm F in the shape of a roll, film feeding capstan roller 14 and a pinch roller 15. The capstan roller 14 is coupled with a forward and backward rotating motor, and rotates so as to feed the microfilm F to the reel 13 from the reel 12, or to feed the film to the reel 12 from the reel 13, in accordance with a rotating direction of the motor. Also, this device is provided with film guide rollers 16, 17, illuminating lamp 18, condenser lens 19, and a lens 20 for magnifying and projecting a picture frame of the microfilm illuminated by the lamp 18 to a screen 21, and provided with a mark detector 22 for detecting a mark provided in accordance with the picture frame on the microfilm F.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mark detection device for detecting a mark on a support such as a film or a cart having marks.

The conventional mark detection device has a block 1 arranged along the movement path of the film F shown in FIGS. 1(A) and 1(B), and circular through holes 2, 3, etc.
4 are provided, and cylindrical optical fibers 5, 6, and 7 are fitted into the respective holes 2, 3, and 4, and the lower end surfaces of the fibers 5, 6, and 7 are made to face the film F. Microfilm F has frames in which information is recorded and a mark m on the side of each frame.
Optical signals from the marks are detected by photoelectric conversion elements via fibers 5, 6, and 7. The holes 2, 3 and 4 in the block 1 are arranged at predetermined intervals in the direction of film movement and have a diameter slightly larger than the diameter of the fibers 2, 3 and 4 to facilitate insertion of the fibers.

Each fiber inserted into the hole is fixed in the hole by adhesive, but due to the difference in the diameter of the hole and the diameter of fiber d, the fiber is fixed in the hole at an angle, so that the lower end surface (plane) of the fiber or is not parallel to the plane of film F,
In addition, the distance between the lower ends of each fiber varies and is not as specified, and even if a mark is located near the tip of a tilted fiber, light from around the mark enters the tip of the fiber, which causes each There have been problems such as the photoelectric conversion element being unable to detect the mark at a predetermined time, the stop position of the film being missed, and the photoelectric conversion element not being able to correctly detect the 1-o mark.

An object of the present invention is to solve the above-mentioned problems.Hereinafter, the present invention will be explained with reference to specific examples shown in the drawings.

FIG. 2 shows a reader link to which the present invention is applied, in which 12.13 is a reel for winding up a microfilm F40, 14 is a capstan roller for film feeding,
15 is a pinch roller. The geared tan roller 14 is connected to a forward/reverse motor (not shown), and feeds the microfilm F from the reel 12 to the reel 13 or from the reel 13 to the reel 12 depending on the rotational direction of the motor. Rotate as shown. 16 and 17 are film kit rollers, 18 is an illumination lamp, 19 is a condenser lens, and 2o is a lens for enlarging and projecting the image frames of the microfilm illuminated by the lamp 18 onto the screen 21.

A mark detector 22 detects marks provided corresponding to image frames on the microfilm F.

As shown in FIG. 5, the microfilm F has an image recorded on each frame A, and a mark m is recorded corresponding to each frame. Mark M is around (Pack Grand L)
) and have different densities and are transparent or opaque.

In FIG. 3, the mark m of the microfilm is opaque and the pack ground is transparent, but the present invention can also be used with a film in which the mark is transparent and the hack ground is opaque.

Further, in this embodiment, the transmitted light from the mark is detected by the mark detector, but it is also possible to detect the reflected light from the mark.

FIG. 4 shows details of the mark detector 22.

The mark detector 22 includes a substrate 24 having a rectangular window 23 and optical fibers 25 and 26 for light transmission disposed on the substrate 24.
The microfilm F, which has ψ27 and photoelectric conversion elements 28, 29, and 30, moves below the window 23 in the direction of the arrow.

A holding member 33 is disposed on the side of the window 23, and on the vertical side of this holding member 33, there are shown in FIGS.
As shown in the figure, V-shaped grooves 35, 36, and 37 extending perpendicularly to the plane of the film F are formed. Each groove has a substantially V-shape, has the same shape, and is formed at predetermined intervals in the direction of movement of the film.

The optical fibers /ζ-25, ζ-26, and 27 are made of a single glass fiber in a cylindrical shape, and each has the same diameter.

The cylindrical side surfaces near the tips of each Phi/<-25, 26, and 27 are engaged with the grooves 35, 36, and 37 as shown in FIG. They are each pressed against the groove by a spring 40. By pressing the sides of the fibers into the grooves, one end of each fiber becomes perpendicular to the plane of the film, and is placed at a predetermined distance in the direction of film movement, so that one end face (plane) of each fiber is Almost parallel to the film surface.

The end surfaces of each fiber face the movement path of the mark m on the film, are spaced apart by a predetermined pressure # in the film movement direction, and are located on the same plane. Further, the other end surfaces of the fibers 25, 26, and 27 face the photoelectric conversion elements 28, 29@30.

Microfilm F is lamp 8 and fibers 25 and 26
・When moving between the tip surfaces of 27, the fiber 25.2
The light emitted to the optical fibers 6-27 is interrupted by the marks m, and the optical signals from the marks are guided to the corresponding photoelectric conversion elements 28, 29, and 30 transmitted by each fiber. When the light entering the fiber is blocked by the mark m, the photoelectric conversion element outputs a mark detection signal.

After each fiber is pressed against the groove by the leaf spring, the leaf spring and the fiber may be fixed to the holding member 33 with adhesive to prevent the fiber from coming out of the groove. Also,
A plate material may be used instead of the plate spring, and the fibers may be pressed into the grooves using a temporary phase, and then the fi/he may be fixed by adhesive or the like.

In the above embodiment, three pairs of fibers and photoelectric conversion elements are used.
The present invention can also be applied to the case where one set or more than one set is provided. The purpose of providing three sets is to prevent the mark detector from generating false signals due to dust or scratches on the film.
By combining the 30 output signals, it is possible to remove erroneous signals and perform a correct search. Since the circuit for removing erroneous signals is well known, the explanation thereof will be omitted.

Furthermore, since a search device for searching for a desired frame on a film using the output signal of a mark detector is well known, a description thereof will be omitted.

As the Yark support, not only microfilm but also cards, tapes, sheets, etc. with marks recorded thereon can be used.

As described below, according to the present invention, the tip of the optical fiber /\- is in a posture almost perpendicular to the plane of the mark support, and when a plurality of optical fibers are provided, the distance between the optical fibers is As a result, the mark can be detected reliably, and the mark support can be accurately stopped at a predetermined position using the mark.

[Brief explanation of drawings]

Figure 1 (A) is a block diagram of a conventional mark detector;
B) is a cross-sectional view of the mark detector taken along the line I-I, FIG. 2 is a configuration diagram of a reader printer showing an embodiment of the present invention, FIG. The figure is a perspective view of a mark detector to which the present invention is applied;
5(B) is a sectional view taken along the line V-V in FIG. 5(A). 33-----Holding member 25, 26, 27----Optical fiber 35 order 36.
37---Ichizo Applicant Canon Co., Ltd. 67

Claims (2)

[Claims] (1) A member with a V-shaped groove extending perpendicular to the plane of the mark support is provided along the movement path of the mark holder, and the side surface of the optical fiber for light transmission is pressed into the V-shaped groove of this member. A mark detection device characterized in that one end of the optical fiber faces a moving path of a mark holder, and the other end faces a photoelectric conversion element. (2) The mark detection device according to claim 1, wherein the optical fiber is pressed into a groove of the member by a spring.