JPH03118534A - Image projector - Google Patents

Abstract

PURPOSE:To minimize the occupied length of a projector in an optical path direction, to prevent deterioration in image quality resulting from light quantity loss and to miniaturize the projector by developing and arranging plural operational members operating a holding member made of plural optical elements in a plane perpendicular to an optical axis. CONSTITUTION:A cyan filter is fitted in the opening of a cyan filter holder 4 and held therein. An ND filter and a diffusing plate are held in an ND filter holder 5 and a diffusing plate holder 6, respectively. The control of the rotation of rotating plates 35, 36 and 37 controls the vertical move of the holders 4, 5 and 6. When the motor of the rotating plate 37, for instance, is driven and the rotating plate 37 is rotated and driven in the arrowed direction a driving pin 40 rocks the rocking arm 22 upward while sliding in the sliding groove 22a of a rocking arm 22. Consequently, the operational pin 13 moves upward to push up the cyan filter holder 4.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an image projection device for projecting an image on a transparent original such as a film, and in particular to a printing device for exposing photographic paper, and for converting an image into electricity using a photoelectric conversion element. The present invention relates to an image projection device applied to a film reading device that converts signals into signals.

<Prior Art> Conventionally, as this type of apparatus, one equipped with printing and reading functions as shown in FIG. 9, for example, is known.

In the figure, 101 is a halogen lamp as a light source, and a plurality of condensing lenses 102 are provided in front of it. Further, in front of the condensing lens 102, a cyan filter 103, an ND filter 104, and a diffusion plate 105 as a diffusion member are arranged in order, and each can be inserted into and taken out from the optical path of the projection light by a mechanism to be described later. be.

In front of the diffusion plate 105 is a film 1 as a transparent original.
06 is fixed and illuminated by light from a lamp 101, and the image on the film 106 is formed as a projected image by a projection lens 107 onto a scanning surface 110 of a CCD 109 serving as a projection surface or onto photographic paper 108. be done.

And cyan filter 103. The reason why the ND filter 104 can be moved in and out of the optical path is to read negative films and positive films, which have different color characteristics. That is, the cyan filter 103 is for correcting the base color of the negative film, and is for correcting the color of the base of the negative film.
The filter 104 is used when reading a positive film, and the cyan filter 103 and a negative film when reading a negative film.
This is to correct the amount of light so that it is not too bright compared to the combination of . On the other hand, the diffuser plate 105 is intended to reduce the effects of granular noise, dust, and scratches on the film, and depending on the type of film and the operating mode of the device, each filter 103, 104 and the diffuser plate 105 may be used independently. Each filter 103, 104 and the diffuser plate 105 may be used in combination, or may not be used at all.
Both can be moved in and out of the optical path independently.

This cyan filter 103. The mechanism for inserting and removing the ND filter 104 and the diffusion plate 105 is the cyan filter 103.
ND filter 104. The diffuser plate 105 is fixed to the holders 111, 112° 113, respectively, and each of the holders 111 to 113 is fixed to the link plate 114° 1, respectively.
Solenoid 117°118.11 via 15.116
It consists of a link mechanism connected to 9. and,
By operating each solenoid 117 to 119,
Cyan filter 103, ND filter 104, diffuser plate 1
05 can be moved in parallel in the direction of the arrow to place them on the optical path or retreat from the optical path.

<Problems to be Solved by the Invention> However, the drive device for an optical element such as a filter or a diffuser plate as in the conventional example described above has the following drawbacks.

(1) Length of a fairly large range in the optical path length direction [
(optical element holder + solenoid) x 3], resulting in a longer optical path length, loss of reading light amount, and deterioration of image quality.

(2) When removing the optical element from the device main body, it is necessary to disassemble the link mechanism or temporarily remove the entire drive mechanism;
Workability is poor for maintenance such as cleaning when image quality deteriorates due to dust.

(3) Since the holders that hold each element have similar shapes, it is easy to mix up the drive unit and holder after disassembly for maintenance work as described above, which can cause malfunctions. Prone.

SUMMARY OF THE INVENTION An object of the present invention is to provide an image projection apparatus that is compact, has good image quality, and is easy to maintain by eliminating the drawbacks of the conventional example.

Means for Solving the Problems> In order to achieve the above object, the image projection device of the present invention includes a light source, a plurality of optical elements that transmit and optically characterize the light from the light source, and a plurality of optical elements that transmit and optically characterize the light from the light source. Holding means for holding a plurality of optical elements, a guide member for guiding the moving direction of the optical elements held by the holding means so that the optical elements can be inserted into or withdrawn from the projection optical path, and moving in the moving direction. a plurality of actuating members that are capable of applying a moving force to the holding means in a one-to-one correspondence and that are arranged side by side at intervals in a direction perpendicular to the direction of movement; and a driving means that drives the actuating members. It is constructed.

Further, the holding means may be made detachable from the operating member independently without removing the operating member and the driving member from the apparatus main body.

Further, each of the holding means has a protrusion, and the guide member includes a regulating member that interferes with the protrusion of the holding means on a guide path other than the one-to-one correspondence and restricts movement of the holding means. is preferable.

Further, it is preferable that the cross-sectional shape of the guide member of the holding means has a specific shape, and that the guide member has a shape of a guide path that corresponds to the specific cross-sectional shape of the holding means.

The image projection device configured as described above can deploy and arrange a plurality of actuating members for actuating the holding members of a plurality of optical elements in a plane perpendicular to the optical axis, suppress the occupied length in the optical axis direction as much as possible, and Each optical element can be driven independently.

Furthermore, since the holding means for each optical element can be easily attached and detached from the actuating means, maintenance can be facilitated.

Further, by providing a regulating member that regulates movement using a protrusion provided on the holding member, it is possible to prevent the subsequent movement of the holding means for the optical element.

<Example> Hereinafter, an example of the present invention will be described based on FIGS. 1 to 3.

FIG. 1 is a perspective view of an optical element holder of an image projection device.

In the figure, a cyan filter 1 is fitted into an opening of a cyan filter holder 4 and held. Same <ND
The filter 2 is held by an ND filter holder 5, and the diffusion plate 3 is held by a diffusion plate holder 6. Each holder 4.5.
The lower part of 6 has protrusions 4a, 5a, and 6a, respectively,
These protrusions are in different positional relationships (shifted perpendicularly to the longitudinal direction of the protrusions), and grooves 4b, 5b are formed at the lower ends of the protrusions 4a, 5a, 6a, respectively.
6b is provided.

The rail support 10 has an exposure hole 10a in its upper part through which light for exposure passes, and rails 7.8 extending vertically are fixed to both side edges of the rail support 10, and the exposure hole 10a
A lamp and a condensing lens (not shown) are arranged on the rear side of the rail support base 10 along the exposure optical axis A passing through the rail support base 10 .

The rails 7.8 guide and hold the left and right sides of the holders 4.5.6, and are stepped in the front and back directions so that the left and right ends of each holder 4.5.6 fit into the grooves of each rail 7.8 at the same time. Step protrusions 4c, 4d, 5c, 5d.

6c and 6d are recesses 7a in the grooves of each rail 7.8.

8a, 7b, 8b, 7c, and 8c, respectively. Then, when each holder 4.5.6 is inserted into both rails 7.8, each holder 4.5.6 can freely move in the vertical direction, but is restrained in the horizontal direction and the light @A force direction.

On the other hand, a first regulation plate 11 and a second regulation plate 12 are fixed to the middle part of the rail support 10, and as shown in FIG. Only when the filter holder 4 is fitted into the groove with the recesses 7a and 8a of the rail 7°8, there is a gap B through which the protrusion 4a of the cyan filter holder 4 can pass downward, and there is also a gap B between the first regulating plate 11 and the groove. The ND filter holder 5 is located between the second regulating plate 12 and the recess 7b of the rail 7.8.

There is a gap C through which the protrusion 5a of the ND filter holder 5 can pass downward only when the ND filter holder 5 is fitted into the groove 8b, and similarly, the first regulating plate 11 and the second regulating plate 2 have a diffusion plate holder. Only when the diffuser plate holder 6 is fitted into the groove with the recesses 7c and 8c of the rail 7.degree. 8, there is a gap through which the protruding portion 6a of the diffuser plate holder 6 can pass downward. Therefore, each holder 4.5.6 inserted in its normal position falls further downwards.

In addition, a pin guide groove 10c is provided at the bottom of the rail support base 10.
, 10d and 10e are provided at intervals in a direction perpendicular to the movable direction of each holder 4.5°6, and these pin guide grooves 10c and 10d.

10e are penetrated by operating bins 13, 14, and 15, respectively. The operating pins 13, 14, 15 are inserted into pin guide grooves 10c, 10d by a mechanism to be described later.

10e, each operating bin 13.
14.15 are arranged so that when each holder 4.5.6 is inserted and dropped, the respective lower end grooves 4b, 5b, 8b are finally engaged. In this way, when each holder 4.5.6 is set relative to the actuation pin 13, 14.15, the actuation pin 13. j, 4.15
is at the lowest position, the neck lower part @4e, 5e, 6e of each holder 4, 5.6 does not interfere with the first regulating plate 11 and second regulating plate 12, and each holder 4°5 The uppermost ends 4f, 5f, and 6f of the exposure hole 10a are located below the lower end 10b of the exposure hole 10a. On the other hand, working bin 1
If 3.14.15 is at the top position, cyan filter 1, ND filter 2. Each dimension is set so that each center of the diffuser plate 3 is in a positional relationship such that it intersects with the optical axis A. In this way, when any of the operating bins 13, 14.15 is driven to the uppermost position, the holder that engages with it is inserted into the optical path, and conversely, the operating bins 13, 14.15 are driven to the lowermost position. When the holder is engaged with this, the holder is retracted from the optical path.

If it becomes necessary to remove each holder 4.5.6 from the drive rail section, first drive the operating pins 13, 14.
g, 5g, and 6g protrude from the upper end of the rail support stand 10, so they can be easily removed by picking them up.

The drive stand 16 is connected to the rail support stand 10 by the operation bin 13,
It is fixed on the opposite side to the protruding direction of the operating bins 13 and 14.15, and supports the drive mechanism of the operating bins 13 and 14.15.

FIG. 3 shows this drive mechanism.

In the same figure, swinging center stands 17, 18, 19 are fixed to the drive stand 16 at intervals toward the rail support stand 10, and swing arms 20, 21, 22 are connected to pins 23, 24, .
It is swingably supported at the center of 25. Each swing arm 20
, 21.22, and the lift arms 29, 30.31 are fixed to the swinging tips of the pins 26., 21.22.
It is rotatably supported around 27 and 28.

An operating bin 13, 14.15 is fixed to the other end of the lift arm 29, 30.31, and the rail support stand 10
pin guide grooves 10c and 10d.

10e and protrudes toward each holder 4, 5, 6 side. On the other hand, the drive base 16 includes a pin 23 that serves as the center of each swing,
24. Rotating plate centers 32, 33 at the same longitudinal position as 25
．． 34 is fixed, and rotating plates 35, 36 are rotated around this.
．． 37 is rotatably supported and rotated by being separately supplied with rotational force from a drive source such as a motor (not shown). Driving pins 38, 39, 40 are fixed to the rotating plates 35, 36, 37, and rotate integrally with the rotating plates 35, 36, 37 about respective rotating plate center pins 32, 33, 34. Further, the drive pins 38, 39.40 are connected to the swing arms 20, 21.22.
The rotating plates 35, 36, and 37 are inserted into sliding grooves 20a, 21a, and 22a provided in the slide grooves 20a, 21a, and 22a, and can slide in the respective sliding grooves 20a, 21a, and 22a. 3B, swing arm 20.21 via 39.40
．． It can be converted into 22 swinging forces. Furthermore, the swinging of the swinging arms 20, 21.degree. 22 causes the operating bins 13, 14.15 to move up and down within the pin guide grooves 10c, 10d, 10e via the lift arms 29, 30.31.

Therefore, the vertical movement of each holder 4.5.6 can be controlled by controlling the rotation of each rotary plate 35, 36.37. Each rotary plate 35, 36.37 has an arc-shaped light shielding plate 41, 42.43.
are the drive bins 38, 39.4 on the rotating plates 35, 36.37.
It is fixed at a predetermined angular relationship with 0. Each light shielding plate 4
At the outer edge of 1.42° 43, there are light shielding parts 41a and 42a that protrude toward the drive base 16 side with a thickness indicated by a broken line.

43a is provided over the entire length of the arc. The light shielding part 4
1a, 42a, 43a are rotating plate center pins 32.33.3
The detection light paths of photointerrupters 44, 45, and 46 (however, 44 and 45 are not shown) fixed on the drive base 16 in a predetermined positional relationship with respect to 4 are blocked and are in a positional relationship that allows light to pass through.

In this embodiment, the photointerrupter is 44°45.46
Immediately after the light shielding starts, the operating bin 13°14.15 is at the top position, and immediately after the light shielding is finished, the operating bin 13°14.15 is at the lowest position.
5.36°37 rotational position and actuation pin 13.14.1
The position of each holder 4, 5, and 5 can be determined, and the vertical movement of each holder 4, 5, and 6 can be controlled.

When the operating pins 13, 14.15 are at the highest position, the swing center of the swing arms 20, 21.22, the drive pin 3
8, 39.40 and the rotation center of the rotating plate 35° and 36.37. For example, the angle α in the figure is 90°,
The load applied to the operating bin 14 is directed toward the rotary plate center pin 32 via the drive pin 38, so that the load is less likely to act on the rotary plate 35 as a rotational moment. Therefore, even after the drive source is turned off, the rotary plate will not rotate due to the load of the holder, and the holder will not descend. The above applies to the operating bins 13 and 14.
．． The same is true when 15 is at the lowest position; for example, the angle β in the figure is 90°, producing the same effect.

Next, the operation of this embodiment having the above configuration will be explained.

First, when setting each holder 4.5.6,
The operator should press the step protrusions 4 on both the left and right ends of each holder 4.5.6.
c, 4d, 5c, 5d, 6c.

6d into the groove recesses 7a, 8a of the rail 7.8.

Each holder 4.5 to fit 7b, 8b, 7c, 8c
．． 6 cannot be inserted into the rail 7.8 unless the front and back relationships are correct, so there is no possibility of making a mistake in the front and back relationships. Furthermore, even if the combination of the holder and the rail groove into which it is to be inserted is incorrect, the first restriction plate 11 and the second restriction plate 12 will prevent the holder from being inserted only halfway. For example, when the cyan filter holder 4 is inserted into a groove in the rail 7.8 with the recesses 7b and 8b, the bottom of the protrusion 4a of the cyan filter holder 4 interferes with the first regulating plate 11, and the cyan filter holder 4 is inserted only halfway. This allows the operator to notice the mistake and correct the settings.

With the above, it is possible to avoid misunderstanding the relationship between each holder 4.5.6 and the groove of rail 7.8 and the relationship between the front and back sides of each holder 4.5.6.
Setting is completed by simply dropping it into the groove.

Next, when reading a negative film, it is necessary to insert the cyan filter 1 into the projection optical path.

At this time, the motor (not shown) of the rotary plate 37 is driven,
When the rotary plate 37 is rotated in the direction of the arrow, the drive pin 4
0 swings the swing arm 22 upward while sliding in the sliding groove 22a of the swing arm 22. As a result, the actuating pin 13 moves upward and pushes the cyan filter boulder 4 upward. When the light shielding portion 43a of the light shielding plate 43 shields the photointerrupter 46, the power supply to the drive source motor is cut off after an appropriate delay time based on the detection signal.
The short brake is applied to stop the rotating plate 37. At this time, the operating pin 13 is at almost the uppermost position, the cyan filter holder 4 is also pushed up, and the center of the cyan filter 1 reaches a height that coincides with the optical axis A, completing the insertion of the filter into the optical path. After that, even if the power supply to the drive source motor is cut off, the load of the weight of the cyan filter holder 4 will not be applied to the rotating plate 3.
Since the cyan filter holder 4 has a structure in which the moment that rotates the filter 7 is difficult to act on, the cyan filter holder 4 continues to maintain its position. Therefore, the power supply may be cut off during image reading.

After image reading is completed, set cyan filter 1 to the initial position.
That is, in order to move it to a position removed from the optical path, the rotary plate 37 is rotated again in the direction of the arrow by the drive motor. Then, the drive pin 40 is inserted into the sliding groove 22 of the swing arm 22.
Swing the swinging arm 22 downward while sliding it inside a. As a result, the operating pin 13 moves downward, and the cyan filter holder 4 also descends due to its own weight. Light shielding plate 43
When the light shielding section 43a releases the light shielding of the photointerrupter 46, the power supply to the drive source motor is cut off after an appropriate delay time based on the detection signal, and the short brake is applied to stop the rotary plate 37. At this time, the operating bin 13 is at almost the lowest position, the cyan filter holder 4 is also at the lowest position, and its upper end 4f is connected to the lower end 10 of the exposure hole 10a.
b, and the evacuation from the optical path of the filter is completed.

Thereafter, even if the power supply to the drive source motor is cut off, the cyan filter holder 4 continues to maintain its position because the weight of the cyan filter holder 4 is structured so that the moment that rotates the rotary plate 37 is difficult to act on it.

As for other holders, the holders can be raised and lowered in the same manner. Further, even if the actuating pin 14 for the ND filter rises, there is no portion of the lower part of the cyan filter holder 4 or the diffuser plate holder 6 that engages with the actuating pin 14, so it will not rise. This also applies to other combinations of holders and operating pins. Therefore,
Each holder 4, 5, 6 has a one-to-one driving relationship with each operating pin 13, 14, 15.

FIG. 4 shows the main part of the drive mechanism for the actuating pin that operates the holder in another embodiment of the present invention. Note that the configuration other than the drive mechanism is the same as the configuration shown in FIG. 1 above.

In this embodiment, the actuating pin 52 that passes through the guide groove 51 provided on the rail support has a nut portion 52a, and the nut portion 52a is screwed into a screw 53 that rotates integrally with the rotating shaft of the motor 54. It is what was done.

In this embodiment having the above configuration, the operating pin 52 moves up and down by the forward and reverse rotation of the motor 54.

FIG. 5 shows a main part of a driving mechanism for an actuating pin that operates a holder in still another embodiment of the present invention.

This embodiment has a holding plate 63 that holds an operating pin 62 that is passed through a guide groove 61 provided on the rail support. 65 is rotated by a motor 67.

In this embodiment with the above configuration, the pulleys 65 and 66 are driven by the forward and reverse rotation of the motor 67, and the wire 64 is driven to move the operating pin 62 up and down.

FIGS. 6 to 8 each show a structure for eliminating errors in combination of a holder, which is an optical element holding means, and a rail, which is a guide member, according to another embodiment of the present invention. The same parts as those in the embodiment shown in FIG. 1 will be described with the same reference numerals.

The one shown in FIG. 6 has different step lengths on both sides of the holder 4.5.6.

In the case shown in FIG. 7, the overall width of the holders 4, 5, and 6 is varied.

In the case shown in FIG. 8, the thicknesses of the holders 4, 5, and 6 are varied.

<Effects of the Invention> As explained above, the present invention provides that the length substantially occupied by the optical element to be inserted or retracted onto the projection optical path and the drive mechanism therefor on the optical path is determined by the length of the optical element holding means, guiding means, etc. Since it is only the thickness, it can be kept to the minimum and the optical path length can be shortened, preventing deterioration of image quality due to loss of light quantity.
It can be modeled.

Furthermore, since the optical element holding means is easy to attach and detach, cleaning can be easily carried out in the event that the image quality deteriorates due to dust, etc., and maintainability is excellent.

Further, since the optical element holding means can be prevented from being erroneously attached, there are effects such as being able to prevent malfunctions.

[Brief explanation of drawings]

FIG. 1 is a perspective view of essential parts of an image projection device according to an embodiment of the present invention, FIG. 2 is a partial cross-sectional view thereof, FIG. 3 is a plan view of the drive mechanism of the holder, and FIG. 4 is a perspective view of the image projection device according to the present invention. FIG. 5 is a perspective view of a drive mechanism of a holder in an image projection apparatus according to another embodiment of the present invention;
The figure is a perspective view of a holder drive mechanism in an image drive device according to still another embodiment of the present invention, and FIGS. A modified example is shown. FIG. 9 is a schematic diagram of a conventional image projection device. 1... Cyan filter, 2... ND filter, 3... Diffusion plate, 4... Cyan filter holder 5... ND filter holder 6... Diffusion plate holder 4c, 4d, 5c
, 5d, 6c, 6d-step protrusion, 7.8... rail, 1
0...Rail support base, 11...First regulation plate, 12...Second regulation plate, 13, 14.15...Operation pin, 20゜21
．． 22... Swinging arm, 29, 30.3 Drift arm, 35, 36.37... Rotating plate. Engraving of the drawings (no changes to the contents) Figures Figures Figures Figures Procedures Book 1 November 27, 2008

Claims (1)

[Claims] 1. A light source, a plurality of optical elements that transmit light from the light source and optically characterize it, a holding means for holding each of the plurality of optical elements, and a holding means for supporting the holding means. and a guide member that is movable to insert or withdraw the optical element held by the holding means into the projection optical path and guides the direction of the movement, and a guide member that is movable in the movement direction and perpendicular to the movement direction. An image projection device comprising: a plurality of actuating members arranged side by side at intervals and capable of exerting a moving force on the holding means in a one-to-one correspondence; and a driving means for driving the actuating members. 2. The image projection apparatus according to claim 1, wherein the holding means can be independently attached to and detached from the operating member without removing the operating member and the driving means from the main body of the apparatus. 3. Each of the holding means has a protrusion, and the guide member is provided with a regulating member that interferes with the protrusion of the holding means and restricts movement on a guide path other than the one-to-one correspondence that is normal for the holding means. The image projection device according to claim 1 or 2, characterized in that: 4. The cross-sectional shape of the guide member of the holding means each has a specific shape, and the guide member has a guide path shape that corresponds one-to-one to the specific shape of the holding means. 2. The image projection device according to 2.