JPS58162942A - Shutter mechanism of image pickup device - Google Patents

Abstract

PURPOSE:To photograph a balckboard, etc. by a mirror used jointly with a shutter, by constituting so that the mirror comes into and out of an optical path freely. CONSTITUTION:By an image pickup lens 11, a character on the blackboard is projected onto a focusing screen 28. When it is focused, a mirror 43 used jointly with a shutter springs up, and an image of an object to be photographed is projected onto print paper 46 and is photographed. When observing by the focusing screen 28, however, by an operation of a relay lens in the optical path, height of a photographing image is reduced and is projected onto the focusing screen 28, therefore, height of an image pickup body 2 can be reduced. Displacement operation of the mirror 43, the focusing screen 28 and the relay lens 33 is executed by connecting each other by an arm.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an imaging device that takes a picture of characters written on a blackboard, and more particularly, to an imaging device that reflects imaging light that enters a dark box body through an imaging lens toward a photosensitive section. The present invention relates to a shutter mechanism in which a mirror has a shutter function for opening and closing the photosensitive section.

The applicant of the present application has provided a photographic lens protruding from the front side of the dark box body, a focusing plate disposed on the optical path inside the dark box body,
An imaging device was devised that includes a relay lens disposed on the optical path between the focus plate and the lens.

The focusing plate is arranged at a position shorter than the focal length of the imaging lens, and the height of the subject image formed on the focusing plate is higher than that of the subject image actually exposed on the photosensitive paper. Since the height of the dark box is lower, the total height of the dark box body is lower, which has the advantage of making it smaller.

In the imaging device, the present invention operates to open and close a photosensitive section disposed in the dark box main body, and when the opening operation is performed, the above relay lens and focusing plate are brought out onto the optical path in the dark box main body, where the relay lens and focus plate have been arranged until now. An object of the present invention is to provide a shutter mechanism having a mirror shutter that reflects imaging light incident through the imaging lens toward the photosensitive section.

Another object of the present invention is to provide a shutter mechanism suitable for a small-sized imaging device.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. 1 to 3.

FIG. 1 is a longitudinal sectional side view of a portable imaging device to which the present invention is applied. This imaging device 1 has a dark box main body 2 in the shape of a horizontally long rectangular parallelepiped. The dark box main body 2f'i is constructed by forming an upper dark box section 3 and a lower dark box section 4 by abutting and connecting the openings of each of these dark box sections 3 and 4 to each other. A leg portion 5.5 skewers made of a rubber material, for example, are attached to the bottom portion 4A of the lower dark box portion 4.

An imaging lens unit 6 is disposed on the front surface 2A of the dark box main body 2. This imaging lens unit 6tr
i. Each of the dark box parts 3 on the front surface 2A of the dark box main body 2
, 4, and has a cylindrical housing 8 that is fitted into a circular opening 1 that extends over the openings 1, 4, and 4. A cylindrical slide guide tube 9 having outward main 7 flange portions 9a, 9b at both ends in the axial direction is fitted into the housing 8. The housing 8 and the slide guide cylinder 9 are fixed together with screws 10. A lens barrel 12 incorporating an imaging lens 11 is slidably inserted into the slide guide tube 9.

The imaging lens 11 has three lenses IIA and 11Bi.
'It is composed of IC. Each of these lenses x11A
, IIB, 11 (Jj) are positioned at a predetermined distance apart by two cylindrical lens supports 13A and 13B disposed within the lens barrel 12.

The lens barrel 12tri, the upper part 12A of the lens barrel 12
A long hole 15 formed in the slide guide tube 9 is formed by a cylindrical focus adjustment lever 14 attached to the slide guide tube 9.
It can be slid freely within the length direction width. The focus adjustment lever 14 is supported at its base end 14a via a hinge portion 16 so as to be bendable relative to the lens barrel 12. The hinge portion 16 is a flat lever holder screwed to the lens barrel 12, and the lever 1 is connected to the body 11.
4 and a ball 18 housed in the base end 14m of the ball 4. The ball 18 is connected to the lever 14
shirt (positioned and fixed inside by screws 19) 20
The lever receiver is kept in pressure contact with the body 11 at all times by means of a compression coil spring 21 incorporated in one end of the lever receiver. The lever 14 is arranged so that the elongated holes 14A, 14A (see FIG. 3) formed in the front surface of the base end 14m of the lever 14 are positioned on the side of the body 11. The lever 14 can be bent by rotating it in the shaft rotation direction and tilting the lever 14 forward. Note that the opening width of the elongated hole 14A is required to be larger than the thickness of the body 17 of the lever receiver.

Further, a long hole 2 formed in the upper part of the housing 8
The opening length of No. 2 is also larger than the length of the lever 14, and by bending the lever 14, the lever 14 can be stored in the housing 8 (No. 3).
(see figure).

Further, the housing 8 is slidably supported along a cylindrical slide guide tube 23 fixed to the edge of the opening 7 in the dark box main body 2. The entire dark box main body 2 can protrude into and out from the front surface 2A. Note that the front surface 4Bl of the lower dark box section 4
'i:Vi, a reinforcing plate 24 is attached so that the dark box section 4 does not bend due to the weight of the imaging lens unit 6. A slide guide groove 25 is formed in the outer peripheral surface of the lower part of the housing 8 in the axial direction. A guide pin 26 that protrudes inward at the lower part of the slide guide tube 23 is fitted into the guide groove 25 . Both ends 25a of the guide groove 25.

25bl/i:Fi, a pin locking groove (not shown) continuous with the groove 25 is formed. These locking grooves are for locking the housing 8 so that it does not move in the axial direction when the imaging lens unit 6 is pulled out from the dark box main body 2 or when it is stored in the dark box main body 2. be. Further, the rear end 8aK of the housing 8 is stopped by one end 23a of the slide guide cylinder 23, and is formed with an outward 7-rank portion 2T that prevents the housing 8 from being removed from the front surface 2A of the dark box main body 2. has been done.

On the other hand, inside the dark box main body 2, the imaging lens 1
The above-mentioned imaging lens 1 is placed at a position shorter than the focal length of lens 1.
A focus plate 28 is provided for viewing a subject image formed by the imaging light incident through the lens 1 . The upper end of the focusing plate 28Fi is attached to a first support shaft 29 which is installed and fixed on the left and right side plates 3a and 3b of the upper dark box section 3 of the dark box main body 2.
0m is positioned and fixed to one side (the right side in FIG. 1) of the first frame 30 which is rotatably assembled.

That is, the focus plate 28I/i, the first support shaft 29
It is rotatably supported around the center. In addition, an L-shaped stopper piece 31 fixed to the dark box main body 2 is arranged at the upper front part of the first frame 30. The other side of the frame 30 is received by the tip 31a of the stopper piece 31, so that the focusing plate 28 is supported so as not to rotate further clockwise in FIG. 1. At this time, the focusing plate 28II'i is supported perpendicularly to the optical axis of the imaging lens 11. Furthermore, on one side of the first frame 30, a mirror shirt j! will be described later! An L-shaped stopper plate portion 32 that prevents rotation during the closing operation of -43 maintains a parallel relationship with the frame body 30 and is provided protruding from the other end 30b of the frame body 30.

Further, in the dark box main body 2, a convex lens (Fresnel lens) 33, which is a relay lens, is disposed on the optical path between the focusing plate 28 and the imaging lens 11. This convex lens 33Fi, one side of the second frame 34 (
It is fixed to the right side in Figure 1. The second frame body 3
4 have left and right side plates 3a, 3 of the upper dark box section 3.
One end 36 is attached to the second support shaft 35 which is installed and fixed on the upper side between b.
Convex lens operating link 3 in which a is rotatably assembled
The other end 36b of the bearing 6 is rotatably assembled via the plate 31. Further, in the front part (right part in FIG. 1) of the second frame 34, one support plate 49, which will be described later, is provided.
A is located, and the second frame 34 is stopped on one side of the support plate 49A, so that the convex lens 33
is vertically supported so that its front axis is coaxial with the optical axis of the imaging lens 11. Note that a circular opening 38 is formed coaxially with the housing 8 in the support plate 49g#. The diameter of this opening 38 is
The outer diameter of the housing 8 is larger than that of the housing 8.

In addition, in the dark box main body 2, a rear portion of the focusing plate 28 is provided with a structure for reflecting the subject image formed on the focusing plate 28 toward the rear upper corner portion 3A in the upper dark box portion 3. A fixed mirror 39 is arranged with a predetermined inclination angle. A small peephole 40 is provided in the corner portion 3A, and this peephole 40 has the following features:
A small finder unit 42 incorporating an eyepiece 41 is assembled.

On the other hand, in the dark box body 2, below the focus plate 28, a shutter 43, which also constitutes the shutter mechanism 100, is arranged.

On the rear surface 43A side of this mirror shutter 43, there is a tray 1.
The mounting plate 44 is mounted between the left and right side plates 4'a..., 4b of the lower dark box section 4. ”
One end of the third support shaft 45 (right end in Figure 1)
44a is rotatably assembled. A photosensitive section 46 serving as a printing section is arranged below the mirror shutter 43.

Note that the position of this photosensitive section 46 is the focal position of the imaging lens 11. This photosensitive section 46 is opened and closed by the rotation of the mirror shutter 43. A photosensitive paper (not shown) is fed into the photosensitive section 46. The photosensitive paper is a heat-developable photosensitive paper that is wound into a roll and stored in a magazine placed at a predetermined position within the dark box main body 2.

In the front and rear parts of the photosensitive section 46 (left and right parts in FIG. 1),
Two pairs of conveyor bells 47a, 47b, 48&, 4gb, which serve to pull out the photosensitive paper from the magazine, are arranged in parallel. Each belt 47a, 47b,
48a and 48b are rotatably constructed between a pair of support plates 49A and 49B vertically erected on the bottom surface 4B of the lower dark box section 4 at a predetermined distance apart, with the photosensitive section 46 therebetween. The rollers 251 are assembled on both ends of the rotary shafts 50a, 50b, 50c, and 50d by being wound in a closed loop between eight fixed rows 251, respectively.

And each of these belts 47m, 47b, 48a, 48
The photosensitive paper is pulled out from the magazine while pinching both side edges of the photosensitive paper between the paper arms 4 and 5, and is sent to and loaded into the photosensitive section 46. The photosensitive paper is supported at its upper and lower surfaces by a pair of upper and lower support frames 52A and 52B for guiding the photosensitive paper, which are fixed between the support plates 49A and 49B, and the photosensitive portion 46 0 maintaining the horizontality of the photosensitive paper at
The photosensitive paper pulled out from the magazine by the running drive of is fed into the photosensitive section 46, where it remains for a predetermined time, and then fed into a heater section (not shown), where it is thermally developed. Thereafter, the paper is sent out through a paper delivery port (not shown) provided on the right side plate 4b of the lower dark box section 4 of the dark box main body 2. In addition, the above photosensitive paper is
When fed into the photosensitive section 46, it is separated from the roll body by a cutter (not shown) provided on the entrance side of the photosensitive section 460. Therefore, when the photosensitive paper is sent out from the paper delivery port, the photosensitive paper is of a predetermined size (for example, B5).

On the other hand, between the one end 43a side of the mirror shutter 43 and the photosensitive section 46, there is a space between the one end 43a side of the mirror shutter 43 and the photosensitive section 46. A light shielding plate 53 is provided to prevent the incident light from directly hitting the photosensitive paper that is sent into the photosensitive section 46 . This light shielding plate 53 operates in conjunction with the opening/closing operation of the mirror shutter 43, and is housed between the shutter 43 and the photosensitive section 46 when the mirror shutter 43 is in the closed operation state. When the mirror shutter 43 is opened, it rotates counterclockwise in FIG. 1 about the fourth support shaft 54 and is brought out onto the optical path of the dark box body 2.

Next, the drive mechanism 55 for the mirror shutter 43 will be explained. Fixed to the other end 43b of the mirror shutter 43 is one end of a first link 56 that faces toward the one end 43a of the shutter 43 and is inclined at a predetermined angle. The other end of the link 56 is connected to the dark box main body 2 via a connecting pin 57.
One end of a long M2 link 58 that moves in the front-rear direction is rotatably connected. This second link 58 is
The other end is tilted upward at a predetermined angle and the dark box main body 2
A light shielding plate actuator rotatably supported by a fifth support shaft 59 fixed to the dark box main body 2 is located at the other end side of the second link 58, which is located in the front part of the dark box body 2. The bin 61 that rotates the lever 60 for
is fixed. At the other end of this second link 58, there is a sixth support shaft 62 whose one end is installed and fixed between the left and right side plates 4a and 4b of the lower dark box section 4 on the front side of the one support plate 49A. The third link 63 is rotatably connected via a connecting pin 64 to the other end of a third link 63 which is rotatably assembled to the third link 63 . Further, the sixth support shaft 62 includes:
One end of the elongated fourth link 65 is rotatably assembled. The other end vcVi of this fourth link 65 is assembled at I1- in the same way as the second link 58 described above. At the other end of this fifth link 66, the focusing plate 28
A letter-shaped operation plate 67 is fixed to rotate the .

The horizontal plate portion 68 of the operation plate 67 includes the focusing plate 28.
, the first l is 0 formed on the front end side (the left end side in FIG. 1) of the horizontal plate portion 68, and the bottom it of the groove portion 69 is
s 69 a comes into contact with one side surface (the right side surface in FIG. 1) of the stopper plate portion 32, thereby preventing the rotation of the focusing plate 28 in the counterclockwise direction in FIG.
i Supported vertically. Further, the intermediate portion of the convex lens operating link 36 is rotatably connected to the intermediate portion of the fifth link 66 in the longitudinal direction via a connecting pin 10.

Then, in the dark box main body 2, the third and fourth
In the front part of the links 63 and 65, each of these links 6
First and second cams 71.72 driving the cam 3.65 are arranged. Each of these cams 71, 72Vi, a drive shaft 1 integrally connected to a rotating shaft of an electric motor (not shown)
3, the center part is assembled. The first cam 71Vi is a cam that rotationally drives the fourth link 65, and the second cam 72f'i is a cam that rotationally drives the third link 63. The first cam 11
' rotates counterclockwise in FIG.
5 operates before the third link 63, and the second cam 72 rotates counterclockwise in FIG. 72B
is fixed to the middle part of the third link 63.
The link 63 is configured to operate later than the fourth link 65 when the retaining pin T5 is pressed.

Next, a first explanation will be given regarding the operation of the imaging device 1 having the above configuration.
This will be explained according to the drawings and FIG.

First, when the main switch (not shown) is turned on, the drive shaft 73 rotates counterclockwise in FIG. Rotating. As the rows 250 rotate, the photosensitive paper stored in the magazine is fed into the photosensitive section 46 while being guided by the supporting plates 52At5zn. The photosensitive paper is held in the photosensitive section 46 until the shutter 46 is opened and then closed again.

At this time, due to the rotation of the drive shaft 73, each of the cams 7
1.72 also rotates in the same direction, and first, the arcuate surface 71A of the first cam 11 presses the first retaining pin 14 of the fourth link 65. By pressing the engagement pin 74, the fourth link 65 rotates clockwise in FIG. 1 about the sixth support shaft 62, and the fifth link 66 rotates clockwise in FIG. Move to. By this movement of the fifth link 66, the convex lens operating link 36 rotates counterclockwise in the figure around the second support shaft 35, and the convex lens 33 is pulled up to the upper side inside the dark box main body 2. . In addition, the fifth
By moving the link 66, the other side of the top plate portion 3'2 (the left side in FIG. 1) is pressed, and the focus plate 2 is moved.
8 rotates counterclockwise in FIG. 1 around the first support shaft 29 and is pulled up.

As the rotation of the first cam 71 progresses, as shown in FIG.
When the convex lens 3 is pressed against the retaining pin 74 of
3 and the focus plate 28 are in a substantially fully lifted state. At this time, the second frame 34 is connected to the convex lens positioning inclined plate 1 disposed behind the focusing plate 28.
1 prevents further increases.

At this time, the tip end surface 72B of the protrusion 12A of the second cam 12 presses the second locking pin 15 of the third link 63 as shown in FIG. By pressing the pin 15, the third link 63II'i
It rotates counterclockwise in FIG. 2 about the sixth support shaft 62, and the second link 58 moves rightward in the figure. Due to the movement of the second link 58, the first link 56 rotates clockwise in the figure around the third support shaft 45, and the mirror shutter 43 also rotates in the same direction around the third support shaft 45. It rotates clockwise in the figure to open the photosensitive section 46 and is drawn out onto the optical path inside the dark box main body 2.

In addition, at this time, the first link 56 is connected to the stopper shaft 1 that is protruded from the front surface of the other support plate 49B.
Uke is stopped by 8.

Furthermore, by moving the second link 58,
The light-shielding plate actuating lever 60 rotates clockwise in FIG. 2 about the fifth support shaft 59 when the pin 61 presses the lever 60 . By rotating this lever 60,
The base end 60a of the lever 60 pulls the lever retaining piece 19 provided at the base end of the light-shielding plate 53 to the left in the figure, and moves the light-shielding plate 53 counterclockwise in the figure about the fourth support shaft 54. direction, and the light shielding plate 53 is brought out onto the optical path inside the dark box main body 2, as shown in FIG.

When the mirror shutter 43 enters the open operating state, the rotation of the drive shaft 13 is stopped for a predetermined period of time, and the imaging light reflected by the mirror shutter 4°3 is exposed onto the photosensitive paper. And the mirror shutter drop 43
When a predetermined time (predetermined exposure time) has elapsed after the opening operation, the drive shaft 13 begins to rotate counterclockwise in FIG. When the second cam 12 rotates and the distal end surface 72B is disengaged from the second engagement pin 75, the third link 63 is moved to the second link 58.
is rotated counterclockwise in FIG. 2 about the sixth support shaft 62 by the first tension spring 80 that pulls it toward the left in FIG. Then, the engagement between the light-shielding plate operating lever 60 and the pin 61 is released, and the light-shielding plate 53 rotates clockwise about the fourth support shaft 54 and falls toward the photosensitive section 46 side. Further, the mirror shutter 43 rotates in the counterclockwise direction in FIG.
6 will be closed late.

Further, as the rotation of the first cam 71 progresses and the engagement between the arcuate surface 71A of the cam 11 and the first engagement pin 14 is released, the fourth link 65 moves the fifth link 66 to the fifth link 66. It rotates clockwise in FIG. 2 about the sixth support shaft 62 by the second tension spring 81 that pulls in the left direction in FIG. 2. This fifth
When the link 66 of the convex lens 3 is drawn in, the convex lens 3
3 and focusing plate 28 are again attached to the dark box main body 2 as shown in FIG.
The optical path of the imaging lens 11, that is, the light @ll of the imaging lens 11
l K is played out again.

As described above, according to the shutter mechanism 100, the movement range of the shutter 43 is adjusted in conjunction with the operation of the convex lens 33 and the focusing plate 28/I'i, and the movement range of the shutter 43 is changed before the opening operation of the shutter 43. Since the opening movement of the shutter 43 is moved outside, it does not affect the opening operation of the shutter 43 in any way. Further, by alternately moving the shutter 43, the convex lens 33, and the focus plate 28 onto and out of the optical path, the space within the dark box body 2 can be used effectively. Therefore, the shutter mechanism 100Fi is suitable for a small-sized imaging device.

Further, when the exposure of the subject image onto the photosensitive paper is completed, the photosensitive paper is sent out through the heater section and the paper feed outlet.

In the imaging lens unit 6, the guide bin 26 is moved out from the locking groove formed in the other end 25b of the guide groove 25 to the guide #125 by rotating the housing 8 in the direction around the axis of the housing 8. When the housing 8 is pushed into the dark box main body 2, the housing 8 is pushed through the opening 38 of the one support plate 49A and pressed against the other side of the second frame 34 to which the convex lens 33 is fixed. Then, as shown in FIG. 3, the operating link 36 supporting the convex lens 33 moves counterclockwise around the second support shaft 35 while moving the fifth link 66 rightward in the figure. rotate to
The convex lens 33Fi moves to the rear side inside the dark box main body 2. Then, push the housing 8 to the end and rotate the housing 8 in the direction around the axis so that the guide pin 26
By engaging the locking groove formed in one end 25a of the guide groove 25, the imaging lens unit 6
In other words, the imaging lens unit 6 can be stored and retained in the dark box body 2 when the imaging device 1 is not in use or when being carried around. Therefore, it is possible to prevent dust and the like from adhering to the imaging lens 11 during inconvenient use, and it is also easy to carry.

As described above, according to the imaging device 1, in the state shown in FIG. The subject image is formed on the photosensitive section 46.

Further, in the state shown in FIG. 1, the imaging lens 11
When determining the subject image formed by the imaging light that enters the dark box main body 2 through the imaging lens 1,
Imaging light incident through lens 1 is focused on focus plate 28 via convex lens 33 as a subject image. The height of this subject image is lower than the height of the subject image formed on the photosensitive section 46, and the subject image formed on the focusing plate 28 is transmitted from the small finder unit 42 via the fixed mirror 39. Can be visually observed. At this time, the object image formed on the focusing plate 28 becomes bright because the imaging light is concentrated. In this way, by lowering the height of the object image formed on the focusing plate 28, Dark box body 2
The overall height of the device 1 can be reduced, and the device 1 can be made smaller.

As is clear from the above description, the present invention includes an imaging lens disposed on the front side of a dark box body, a focus plate disposed on an optical path inside the dark box body, and a combination of this focus plate and the lens. A relay lens disposed on the optical path between the image forming apparatus and the imaging light beam formed on the optical path in the dark box main body and the imaging light that enters the dark box main body through the imaging lens while opening the printing surface on the optical path in the dark box main body. a mirror shutter that reflects a subject image and exposes it to the printing surface; the focusing plate and the relay lens are supported so as to be freely put in and out on the optical path in conjunction with the opening/closing operation of the mirror shutter; It is characterized in that the lens is moved out of the movement range of the mirror shutter when the mirror shutter is opened, and the mirror shirt, the relay lens, and the focusing plate are arranged in a dark box main body. The dark box can be moved in and out alternately on the optical path of the dark box, and the space inside the dark box body can be used effectively. Therefore, it is suitable for a small-sized imaging device.

[Brief explanation of the drawing]

1 and 3 are diagrams showing a preferred embodiment of the present invention, in which FIG. 1 is a vertical side view of the imaging device when preparation for imaging is completed, FIG. 2 is a vertical side view of the imaging device at the time of imaging, and FIG. The figure is a longitudinal side view of the imaging lens unit when it is stored. 1 Portable imaging device 2 Dark box body 11 Imaging lens 28 Focal plate 33 Convex lens 360 Convex lens operating link 43 - Mirror shutter 46 Photosensitive part 56.58,63,65,66...1st. 2nd゜3rd
．． Fourth and fifth links 71, 72...Fist first and second cams 100...Shutter mechanism

Claims (1)

[Claims] an imaging lens disposed on the front side of the dark box body; a focusing plate disposed on the optical path within the dark box body; a relay lens disposed on the optical path between the focusing plate and the lens; a mirror shutter that opens a drawn-out stamp screen onto an optical path within the dark box main body, and reflects a subject image formed by the imaging light that enters the dark box main body via the imaging lens to expose the stamp screen; The focusing plate and the relay lens are supported on the optical path in conjunction with the opening/closing operation of the mirror shutter, and the focusing plate and the relay lens are supported when the mirror shutter is opened/closed. A shutter mechanism for an imaging device, characterized in that the shutter mechanism is configured to move outside a movement range.