JP2535002Y2 - Lens positioning device for scanner - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION This invention relates to a scanner of a printer for printing and exposing a negative image of a negative film on photographic paper.
More specifically, the present invention relates to a lens positioning device forming a scanner.

[0002]

2. Description of the Related Art As shown in FIG. 6, light emitted from an exposure light source 1 such as a halogen lamp is applied to a negative film F, and a projected color negative image is printed on a photographic paper S through a lens 2. In the printing apparatus of the printer, the pattern, density, color, etc. of the color negative image is detected by the scanner X incorporated in the exposure section, and the operation of the cut filter 3 for three colors of yellow, magenta and cyan is detected based on the detection signal. , And the color tone of light emitted from the light source 1 is adjusted to enable development of a photograph having an appropriate color.

Here, the scanner X has a reflection mirror 4 inclined with respect to the exposure axis a, and a scanner lens 5 incorporated on the reflection optical axis of the reflection mirror 4, and has passed through the scanner lens 5. The color negative image is split into three primary colors by a prism not shown, and the light amount of each color is detected by a photo sensor.
The operation of the three-color cut filter is controlled based on the detection signal.

The reflecting mirror 4 is provided so as to be able to move forward and backward with respect to the exposure axis a, and is moved backward during printing and exposure of a color negative image on the photographic paper S, and is stopped and held at a position where printing is not hindered. You.

On the other hand, the scanner lens 5 is supported by a lens holder as a set of two lenses having different focal lengths, and one lens is positioned on the reflection optical axis according to the size of the negative film.

FIG. 7 shows a conventional lens positioning device. In this positioning device, two lenses 72 and 73 are mounted on a fan-shaped lens holder 71 rotatably supported about a shaft 70, and a cam 74 is provided on the outer periphery of the lens holder 71. The lever 76, whose rear end is rotatably supported by a pin 75, is deflected in one direction by a spring 77 so that a cam follower 78 at the front end is cam 74.
, The depression 79 of the cam 74 and the cam follower 78
The lens holder 71 is positioned by the engagement with the lens holder 71.

[0007]

In the above positioning device, a cam 74 is provided on the outer periphery of the lens holder 71.
Is formed, the size of the lens holder 71 is increased, and the mechanism is complicated, and the assembling is troublesome.

[0008] The present invention has a technical object to simplify and reduce the size of a lens positioning device.

[0009]

In order to solve the above-mentioned problems, in the present invention, a reflection optical axis of a reflection mirror which is inclined with respect to an exposure axis of an exposure light source and is moved with respect to the exposure axis. A lens holder having a rotation axis at an eccentric position with respect to the lens and having two lenses having different focal lengths on a circumference around the rotation axis, a driving device for rotating the lens holder, and a lens holder And a stopper member for stopping the lens holder at a position corresponding to the reflected optical axis.A pair of permanent magnets is attached to the stopper member. The configuration provided was adopted.

[0010]

When positioning by switching the lens, the lens holder is rotated, the lens holder is positioned by abutting against the stopper member, and the lens holder is held in the positioned state by the action of the permanent magnet attracting the attracting member.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, a positioning block 10
Are supported on a negative mask table not shown. The positioning block 10 has a support wall 11 at a front part, and a plate-shaped first motor frame 12 is attached to one side part. A plate-shaped second motor frame 13 is provided at a required interval behind the support wall 11, and a side plate 14 is attached to the other side of the second motor frame 13.

On both sides of the positioning block 10, two rods 15 and 16 arranged in parallel are slidably supported in the axial direction, and a mirror holder 17 is mounted between the distal ends of the rods 15 and 16. I have.

The mirror holder 17 is, as shown in FIG.
The exposure light source 1 is moved by the axial movement of the rods 15 and 16.
With respect to the exposure axis a. The mirror holder 17 has a reflection mirror 18 having an inclination angle of 45 ° with respect to the exposure axis a.
Is supported.

A rear end of one of the two rods 15, 16 is provided with a first rod made of a magnetic material such as an iron piece.
The suction piece 19 and the second suction piece 20 are provided at a predetermined interval in the axial direction. Stoppers 21 and 22 for limiting the axial movement amount of the rod 15 are provided before and after the movement direction of the first suction piece 19 and the second suction piece 20, and the first suction piece 19 contacts the front stopper 21. By the contact, the mirror holder 17 is positioned so as to stop on the exposure axis a.

The front stopper 21 and the rear stopper 2
2 are provided with permanent magnets 23 and 24 for attracting the first attracting piece 19 and the second attracting piece 20.
The mirror holder 17 is held in a state of stopping on the exposure axis a by the action of sucking the first suction piece 19. on the other hand,
The mirror holder 17 is held at a position retracted from the exposure axis a by the action of the permanent magnet 24 attracting the second attracting piece 20.

As shown in FIG. 4, a suction piece 25 is attached to the rear end of the other rod 16 of the two rods 15 and 16, and a stopper 26 is provided before and after the movement of the suction piece 25. , 27 are provided, and permanent magnets 28, 29 for exciting and attracting the attracting piece 25 are attached to the respective stoppers 26, 27.

When the suction piece 25 comes into contact with the front stopper 26, the first suction piece 19 also moves to the front stopper 21.
When the suction piece 25 comes into contact with the rear stopper 27, the second suction piece 20 comes into contact with the rear stopper 22.

The mirror holder 17 is moved forward and backward by the operation of a moving device 30 provided on one side of the positioning block 10.

As shown in FIG. 4, the moving device 30
A connecting piece 31 is movably provided between the suction piece 19 and the second suction piece 20 along one rod 15, and a tip end of the connecting piece 31 is attached to a part of an endless belt 32 provided in parallel with the rod 15. The endless belt 32 is connected and moved by a mirror drive motor 33 supported by the first motor frame 12.

Here, the first suction piece 19 is connected to the front stopper 2.
State of being attracted to the first permanent magnet 23 and the second attracting piece 2
In a state in which 0 is attracted to the permanent magnet 24 of the rear stopper 22, the endless belt 32 stops the connecting piece 31 at a position where it does not contact any of the attracting pieces 19 and 20.
Is set.

As shown in FIG. 1, a lens holder 40 is provided at the back of the support wall 11. The lens holder 40 has a fan shape as shown in FIG. 2, and a shaft 41 penetrating the center of the fan shape is supported by the support wall 11. The axis 41 is arranged parallel to the reflection optical axis of the reflection mirror 18, and the lens holder 40 is rotatable about the axis 41.

The lens holder 40 has a first lens 42 and a second lens 42 having different focal lengths on one circumference centered on an axis 41.
The lens 43 is attached at a required interval in the circumferential direction.

The lens holder 40 is rotated in the forward and reverse directions by the operation of the driving device 50. The driving device 50 is shown in FIG.
As shown in FIG. 5, a lever 53 supported rotatably about a shaft 41 via a belt transmission mechanism 52 through rotation of a lens drive motor 51 supported by a second motor frame 13.
The lens holder 40 is rotated about the shaft 41 by the engagement between a pin 54 provided at the distal end of the lever 53 and a pin hole 55 formed in the lens holder 40.

The rotation angle of the lens holder 40 is limited by a stopper member 60 supported above the support wall 11. The stopper member 60 has a plate portion 61 projecting above the lens holder 40, and the first lens 42 is positioned on the reflection optical axis of the reflection mirror 18 by abutment of one side surface of the lens holder 40 against the lower surface of the plate portion 61. The lens holder 40 is positioned at the stop position. Further, the contact of the other side surface of the lens holder 40 with the lower surface of the plate portion 61 positions the lens holder 40 at a position where the second lens 43 stops on the reflection optical axis.

As shown in FIG. 3, two permanent magnets 62 and 63 are attached to the plate portion 61 at positions where the respective side surfaces of the lens holder 40 abut.
At both sides of the lens, the attraction pieces 64 and 65 are provided so as to face the permanent magnets 62 and 63, and the lens holder 40 is positioned by the action of each of the permanent magnets 62 and 63 attracting the corresponding attraction pieces 64 and 65. Will be retained. In the holding state, the rotation angle of the lens drive motor 51 that drives the lever 53 is set so that the pin 54 of the lever 53 stops at a position where it does not contact both ends of the pin hole 55.

In FIG. 5, reference numeral 66 denotes a cut filter of three colors consisting of yellow, magenta, and cyan.

The lens positioning apparatus shown in the embodiment has the above-mentioned structure. When scanning a negative image of a negative film, the lens is switched in accordance with the size of the negative film. The mirror holder 17 is moved toward the exposure axis by the operation of 33 to position the mirror holder 17 at a position where the reflection mirror 18 stops on the exposure axis.

When the lens is switched, the lever 53 is rotated by the operation of the lens driving motor 51 and the pin 5 is rotated.
The lens holder 40 is rotated about the shaft 41 by the engagement between the pin holder 55 and the pin hole 55.

For example, when the first lens 42 is used,
The lens holder 40 is rotated in the direction of the arrow in FIG. One side surface of the lens holder 40 abuts on the plate portion 61, and the abutment positions the lens holder 17 at a position where the first lens 42 stops on the reflection optical axis of the reflection mirror 18. Further, the lens holder 40 is held in the positioned state by the action of the permanent magnet 62 attracting the attracting piece 64.

[0030]

As described above, in the positioning device according to the present invention, the lens holder is positioned by abutting the side surface of the lens holder against the stopper member, and the permanent magnet provided on the stopper member is provided on the lens holder. Since the lens holder has a simple configuration in which the lens holder is held in the positioned state by the action of sucking the suction piece, the mechanism of the lens positioning device can be simplified and downsized.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of a positioning device according to the present invention.

FIG. 2 is a perspective view showing the lens holder and its driving device according to the first embodiment;

FIG. 3 is a sectional view showing details of a positioning portion of the lens holder according to the first embodiment;

FIG. 4 is a perspective view showing a mirror holder moving device according to the first embodiment;

FIG. 5 is a longitudinal sectional side view of the above.

FIG. 6 is a schematic diagram showing an exposure unit of the printer.

FIG. 7 is a front view showing a conventional lens holder positioning device.

[Explanation of symbols]

 18 Reflecting mirror 40 Lens holder 42 First lens 43 Second lens 50 Driving device 60 Stopper member 62, 63 Permanent magnet 64, 65 Attraction piece

Claims (1)

(57) [Scope of request for utility model registration] 1. A rotation axis which is inclined with respect to an exposure axis of an exposure light source and is eccentric with respect to a reflection optical axis of a reflection mirror which is moved with respect to the exposure axis. A lens holder provided with two lenses having different focal lengths on a circumference, a driving device for rotating the lens holder, and stopping the lens holder at a position where each lens of the lens holder coincides with the reflection optical axis. A lens positioning device for a scanner comprising: a stopper member configured to attach a pair of permanent magnets to the stopper member; and a lens holder provided with an attraction member that is attracted by the permanent magnet.