JPH04101544U - Lens positioning device in scanner - Google Patents

Abstract

(57) [Summary] [Purpose] To simplify and downsize the mechanism of a scanner lens positioning device in a printer. [Structure] Two lenses 42 and 4 with different focal lengths are mounted on a sector-shaped lens holder 40 that has a center of rotation eccentrically with respect to the optical axis of the reflection mirror and is rotated by a drive device.
Install 3. A stopper member 60 is provided above the lens holder 40. By abutting the side surface of the lens holder 40 against the stopper member 60, the lens holder 40 is positioned such that one of the lenses 42, 43 is located on the reflection optical axis. Further, the permanent magnet 6 provided on the stopper member 60
2 and 63 are suction pieces 64 and 65 provided on the lens holder 40
The lens holder 40 is held in a positioned state by the suction effect.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea is based on the printer's scanner, which prints and exposes the negative image of negative film onto photographic paper. More specifically, it relates to the positioning device for the lens that forms the scanner. be.

0002

[Conventional technology]

As shown in FIG. 6, light emitted from an exposure light source 1 such as a halogen lamp is converted into a negative light. The film F is irradiated, and the projected color negative image is printed onto photographic paper S through lens 2. In the printing device of the printer that is attached to the printer, the scanner detects the pattern, density, color, etc. of the color negative image, and based on the detection signal controls the operation of the three-color cut filter 3 of yellow, magenta, and cyan, and It is possible to develop photographs with appropriate colors by adjusting the tone of the light emitted from 1. .

0003 Here, the scanner It has a scanner lens 5 incorporated on the reflection optical axis of the mirror 4, and the scanner lens The color negative image that has passed through step 5 is separated into three primary colors by a prism (not shown), and the amount of light of each color is calculated. is detected by a photo sensor, and the three color cut filters operate based on the detection signal. is under control.

0004 The reflecting mirror 4 is provided so as to be movable forward and backward with respect to the exposure axis a, and is When printing and exposing a color negative image, it is moved backwards to a position that does not interfere with printing. Stopped and held.

[0005] On the other hand, the scanner lens 5 consists of two lenses with different focal lengths. Depending on the size of the negative film, one lens is placed on the reflective optical axis. Positioned.

[0006] As a positioning device for the above-mentioned lens, the one shown in FIG. 7 has been conventionally known. . This positioning device has a fan-shaped lens rotatably supported around an axis 70. Two lenses 72 and 73 are attached to the holder 71, and the outer circumference of the lens holder 71 is A cam 74 is provided around the lens holder 71, and a pin 75 is provided at the rear end. A rotatably supported lever 76 is deflected in one direction by a spring 77 to The cam follower 78 of the section is pressed against the cam 74, and the recess 79 of the cam 74 and the cam follower The lens holder 71 is positioned by engagement with the lower 78.

[0007]

[Problem that the idea aims to solve]

By the way, in the above positioning device, a cam 74 is provided on the outer periphery of the lens holder 71. In order to form a There is an inconvenience that it takes time to set up.

[0008] This idea aims to simplify the configuration and miniaturize the lens positioning device. This is a major issue.

[0009]

[Means to solve the problem]

In order to solve the above problem, in this invention, a The reflective mirror is tilted and moved with respect to its exposure axis and eccentric with respect to the reflective optical axis. 2, which has a rotational axis at a certain position and has different focal lengths on the circumference around this rotational axis. A lens holder with two lenses and a drive device that rotates the lens holder. , stop the lens holder at a position where each lens of the lens holder is aligned with the above reflected optical axis. a stopper member, and a pair of permanent magnets are attached to the stopper member. , the lens holder is equipped with an attraction member that is attracted by the above permanent magnet. It is.

0010

[Effect]

When changing the lens position, rotate the lens holder and press the stopper. The lens holder is positioned by contacting the member, and the permanent magnet attracts the attracting member. The lens holder is held in position by the action of the lens holder.

[0011]

【Example】

An embodiment of this invention will be described below with reference to FIGS. 1 to 5. In Figure 1, The positioning block 10 is supported on a negative mask stand (not shown). This positioning The mesh block 10 has a support wall 11 at the front, and a plate-shaped first motor frame at one side. A frame 12 is attached. In addition, a required interval is provided behind the support wall 11. A plate-shaped second motor frame 13 is provided, and the other side of the second motor frame 13 A side plate 14 is attached to the section.

0012 Two rods 15 and 16 are arranged in parallel on both sides of the positioning block 10. is supported so as to be slidable in the axial direction, and a mirror is placed between the tips of the rods 15 and 16. A holder 17 is attached.

[0013] As shown in FIG. 5, the mirror holder 17 supports the axial movement of the rods 15 and 16. Therefore, it advances and retreats with respect to the exposure axis a of the exposure light source 1. Expose the mirror holder 17 A reflecting mirror 18 is supported with an angle of inclination of 45° to axis a.

[0014] Of the two rods 15 and 16, one of the rods 15 has a piece of iron or the like at its rear end. The first attracting piece 19 and the second attracting piece 20 made of magnetic material are spaced apart from each other by a required distance in the axial direction. It is provided. Before and after the moving direction of the first suction piece 19 and the second suction piece 20, Stoppers 21 and 22 are provided to limit the amount of movement of the rod 15 in the axial direction. By abutting the first suction piece 19 against the topper 21, the mirror holder 17 is aligned with the exposure axis. It is positioned so that it stops on top a.

[0015] Further, the front stopper 21 and the rear stopper 22 are provided with a first suction piece 19 and a second suction piece 19. Permanent magnets 23 and 24 are attached to attract the attraction piece 20, and the permanent magnet 23 1. The mirror holder 17 stops on the exposure axis a by the action of attracting the attracting piece 19. held in state. On the other hand, due to the action of the permanent magnet 24 attracting the second attracting piece 20, Thus, the mirror holder 17 is held at a position retracted from the exposure axis a.

[0016] Furthermore, among the two rods 15 and 16, at the rear end of the other rod 16, as shown in FIG. As shown, the suction piece 25 is attached, and the suction pieces 25 are placed in front and back in the moving direction. Permanent stoppers 26 and 27 are provided to excite and attract the attraction piece 25 to each stopper 26 and 27. Long magnets 28 and 29 are attached.

[0017] Here, when the suction piece 25 comes into contact with the front stopper 26, the first suction piece 19 also comes into contact with the front stopper 21, and the suction piece 25 also comes into contact with the rear stopper 27. The second suction piece 20 comes into contact with the rear stopper 22.

[0018] The mirror holder 17 is attached to a moving device 3 provided on one side of the positioning block 10. It is moved forward and backward by the movement of 0.

[0019] As shown in FIG. 4, the moving device 30 is arranged between the first suction piece 19 and the second suction piece 20. A connecting piece 31 is provided movably along one rod 15, and the connecting piece 31 The tip of the rod 15 is connected to a part of the endless belt 32 provided parallel to the rod 15. The endless belt 32 is connected to a mirror drive motor supported by the first motor frame 12. I am trying to move it using the tab 33.

[0020] Here, the first attraction piece 19 is attracted to the permanent magnet 23 of the front stopper 21. and the second attraction piece 20 is in a state where it is attracted to the permanent magnet 24 of the rear stopper 22. , the connecting piece 31 stops at a position where it does not come into contact with any of the suction pieces 19 and 20. The amount of movement of the endless belt 32 is set as follows.

[0021] As shown in FIG. 1, a lens holder 40 is provided at the back of the support wall 11. There is. This lens holder 40 has a fan shape as shown in FIG. 2, and the center of the fan shape is A penetrating shaft 41 is supported by the support wall 11. The shaft 41 is the reflecting mirror 18 The lens holder 40 is arranged parallel to the reflected optical axis of the It's free.

[0022] The lens holder 40 has lenses having different focal lengths on one circumference centered on the axis 41. The first lens 42 and the second lens 43 are installed at a required interval in the circumferential direction. Ru.

[0023] The lens holder 40 is rotated in forward and reverse directions by the operation of the drive device 50. Drive As shown in FIG. 2, the motor device 50 includes a lens supported by the second motor frame 13. The rotation of the drive motor 51 is caused to rotate automatically around the shaft 41 via the belt transmission mechanism 52. The signal is transmitted to the lever 53 currently supported, and the pin 54 provided at the tip of this lever 53 The lens is rotated around the axis 41 by engagement with the pin hole 55 formed in the lens holder 40. The holder 40 is rotated.

[0024] The lens holder 40 is attached to a stopper member 60 supported on the upper part of the support wall 11. Therefore, the rotation angle is limited. The stopper member 60 protrudes above the lens holder 40. The lens holder 40 has a plate portion 61 that is attached to the lower surface of the plate portion 61. The first lens 42 stops on the reflection optical axis of the reflection mirror 18 due to contact with one side. The lens holder 40 is positioned at the position shown in FIG. Also, the bottom surface of the plate portion 61 is By contacting the other side of the lens holder 40, the second lens 43 is placed on the reflection optical axis. The lens holder 40 is positioned at a stopping position.

[0025] As shown in FIG. 3, each side surface of the lens holder 40 is in contact with the plate portion 61. Two permanent magnets 62 and 63 are attached to the positions of the lens holder 40. Adsorption pieces 64 and 65 are provided on the sides facing the permanent magnets 62 and 63, and each permanent magnet The lens holder is held by the magnets 62 and 63 that attract the corresponding attraction pieces 64 and 65. The router 40 is held in position. In the holding state, the lever 53 is The lever 53 is driven so that the pin 54 stops at a position where it does not come into contact with both ends of the pin hole 55. The rotation angle of the moving lens drive motor 51 is set.

[0026] In Figure 5, 66 is a three-color cutout consisting of yellow, magenta, and cyan. The filter is shown below.

[0027] The lens positioning device shown in the example has the above structure, and When scanning negative film images, the lens must be changed according to the size of the negative film. After switching, the mirror drive motor 33 operates to rotate the mirror. The position where the holder 17 is moved toward the exposure axis and the reflection mirror 18 stops on the exposure axis Position the mirror holder 17 at .

[0028] When switching the lenses, the lever 5 is operated by the lens drive motor 51. 3, and the lens holder is rotated around the shaft 41 by engaging the pin 54 and the pin hole 55. Rotate 40.

[0029] For example, when using the first lens 42, move the lens holder 40 in the direction of the arrow in FIG. Rotate to. One side of the lens holder 40 contacts the plate portion 61, and the contact Therefore, the lens holder is positioned at a position where the first lens 42 stops on the reflection optical axis of the reflection mirror 18. The folder 17 is positioned. In addition, the permanent magnet 62 has an effect of attracting the attracting piece 64. Therefore, the lens holder 40 is held in a positioned state.

[0030]

[Effect of the idea]

As described above, in the positioning device according to this invention, Position the lens holder by contacting the side of the lens holder with the stopper. The permanent magnet installed on the member attracts the attraction piece installed on the lens holder, which causes the lens to become attached. It has a simple structure that holds the lens holder in position, so the lens The mechanism of the positioning device can be simplified and downsized.

[Brief explanation of drawings]

[Fig. 1] A partially cutaway perspective view showing an embodiment of a positioning device according to this invention.

[Fig. 2] A perspective view showing the same lens holder and its driving device.

[Fig. 3] Cross-sectional view showing details of the positioning part of the lens holder same as above.

[Fig. 4] A perspective view showing a mirror holder moving device same as above.

[Figure 5] Vertical side view of the same as above

[Figure 6] Schematic diagram showing the exposure section of the printer

[Fig. 7] Front view showing a conventional lens holder positioning device.

[Explanation of symbols]

18 Reflection mirror 40 Lens holder 42 1st lens 43 Second lens 50 Drive device 60 Stopper member 62, 63 Permanent magnet 64, 65 Adsorption piece

Claims (1)

[Scope of utility model registration request] 1. A mirror having a rotation axis at an eccentric position with respect to the reflection optical axis of a reflection mirror that is inclined with respect to the exposure axis of the exposure light source and moved with respect to the exposure axis; A lens holder with two lenses having different focal lengths on a circumference, a drive device that rotates the lens holder, and a lens holder that stops at a position where each lens of the lens holder coincides with the reflected optical axis. A lens positioning device for a scanner, comprising a stopper member, a pair of permanent magnets attached to the stopper member, and a lens holder provided with an attraction member attracted by the permanent magnets.