JPS59121325A - Macroprojector - Google Patents

Abstract

PURPOSE:To enable extremely easy changeover of lenses and focus adjustment by constituting a titled device of a turret disc which holds plural photographing lenses, a support members which holds focus adjusting gears and an oscillating member for changing over the lenses. CONSTITUTION:When a signal for changing over a projecting lens 6a positioned in a projecting position to a lens 6b energizes a solenoid 25 to turn a lens changeover lever 21 in a counterclockwise direction, an interference pin 26 forces a focusing lever 18 upward by which the gears 19, 16a for focus adjustment is released from the meshing and a gear 23 of a mechanism 24 for driving the changeover is meshed with a turret gear 12. The projecting lenses 6a-6c having respectively focus adjusting gears 16a-16c are held in the prescribed position on a turret disc 13 and therefore the lens 6b is positioned in the prescribed position by the disc 13 rotated by the gear 23. The changeover of the lenses and the focus adjustment are thus performed by the simple button operation and since the focus driving gears are kept disengaged during the operation for the changeover, the deviation in the focus of the lenses is obviated.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to an enlarged projection apparatus for use in microfilm reader printers and the like.

Conventional technology In recent years, reader printers have built-in projection lenses with multiple types of magnification in order to be able to handle multiple types of microfilm with different reduction ratios. The projection magnification is set to match the reduction ratio of the film being used.

As a conventional example of this type of enlarged projection apparatus, one having a structure shown in FIGS. 1 and 2 is known.

In this enlarged projection apparatus, one end of a lens switching holder A is pivotally mounted on a frame B of the main body so as to be horizontally rotatable.
A plurality of projection lenses DIID2+D1 with different magnifications are held vertically movably so as to be lined up on the circumference of a predetermined circle centered on The lens switching holder A is protruded from the side wall F of the frame to the outside of the device, and by rotating the lens switching holder A around its pivot point C using the operating knob E, the desired projection lens can be set to the projection position. It has been made possible.

However, in this enlarged projection device, each projection lens D□'
r: 2 1 Focus adjustment ring H that can mesh with focus adjustment driven ring G□ IGj9Gj provided in DB,
The rotation axis M of the focus adjustment ring H is inserted into an elongated hole K formed in a plate member J separate from the lens switching holder A, with a part thereof protruding from the side wall F of the frame. , supports the projection lens at the projection position so that it can move forward and backward and rotate freely, and is biased toward the side wall r of the frame by a spring N so as to disengage from the projection lens, thereby adjusting the focus. Only when necessary, the focus adjustment ring H is pressed against the spring N from outside the device and rotated while keeping it in engagement with the projection lens, so that the focus adjustment ring H becomes the zero point adjustment driven ring G1. *G! This is to avoid the lens switching operation being performed while the lens remains engaged with the lens l + G, and to prevent the load during the lens switching operation from increasing and the focus of the projection lens to shift due to the lens switching operation. However, it is very troublesome to adjust the focus of the projection lens.

However, the present invention solves the above-mentioned drawbacks of the conventional example, and makes lens switching and focusing operations extremely easy. The object of the present invention is to provide an enlarged projection device.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 3 to 7.

As shown in FIGS. 3 and 4, the enlarged projection apparatus of this embodiment is configured to project light emitted from a light source unit 5 provided on a pedestal 4- of a main body 3 onto a carrier 2 holding a microfilm 1 therebetween. The image on the microfilm 1 is magnified by the projection lens 6 and the mirror 7
．． 8 onto a screen 9. At the time of copying, the mirror 7 is moved by means not shown to the position shown by the imaginary line in FIG. This is applied to a microfilm reader printer in which an image is formed on a lens mount 15, in which a turret disc 13 having a turret gear 12 on its periphery that is coaxial with the center of rotation is attached to a shaft 14. The turret disk 130 includes three types of projection lenses 6a, 6b, and 6c, which are rotatably supported by the projection lens 6 and have focus adjusting driven gears 16a, 16b, and 16c, respectively, and have different magnifications. A focus adjustment drive gear 19 is pivotally connected to a focus lever 18 which is distributed and held at positions equidistant from the center of rotation and whose one end is rotatably supported on a lens mount 15 by a shaft 17.
While the focus adjustment drive gear 19 is configured to be able to engage and disengage from the focus adjustment driven gear of the projection lens at the projection position as the focus lever 18 swings, the focus adjustment drive gear 19 is separately mounted on the lens mount 15 by a shaft 20. A lens switching lever 21 is rotatably supported, a switching drive mechanism 24 consisting of a motor 22 and a worm gear 23 is attached to the lever 21,
By swinging the lever 21 using the solenoid 25, the worm gear 23 is engaged with and disengaged from the turret gear 12 of the turret disk 13, and the lever 2
An interference pin 26 that can come into contact with the side edge of the focus lever 18 is provided at the other end of the focus lever 18, and as the lever 21 swings, the worm gear 23 and the turret gear 12 are engaged and disengaged, and the focal point 31 of the focus adjustment drive gear 19 is provided. ．． +J node driven gear 1
6a, 16b, and 16c, the interference bin 26 engages with the focus lever 1 before the worm gear 23 of the switching drive mechanism 24 engages with the turret gear 12.
8 to ensure that the focus adjustment driving gear 19 on the focus lever 18 and the focus adjustment driven gear at the projection position are disengaged from each other.

A drive transmission gear 27 is separately provided on the shaft 17 to which the focus lever 18 is pivoted, and this drive transmission gear 27 and the focus adjustment drive gear 19 are interlocked via sprockets 28 , 29 and a chain 30 . The focus adjustment dial 31 supported on the lens mount 15 so as to partially protrude upward is connected via a gear 32 fixed to the rotation shaft of the focus adjustment dial 310 and an intermediate gear 33 supported on the lens mount 15. By interlocking with the drive transmission gear 27, the focus adjustment drive gear 19 can be rotated from the top of the mount 4.

A circular cam plate 34 coaxial with the rotation center of the turret disk 130 is attached to the back surface of the turret disk 13, and each projection lens 6a, 6b, 6 on the turret disk 13
35a and 35b engage with the periphery of the circular cam plate 340 corresponding to the distribution interval c.

35c is provided separately, and a bearing 36 is provided on the lens switching lever 21 as a driven joint that comes into sliding contact with the circular cam plate 34, and this bearing 36 is connected to the engaging U groove 35a.
, 35b, 35a, each projection lens 6a, 6b, 6c can be reliably positioned at the projection position.

The lever 21 is biased by a tension spring 37 to rotate in a clockwise direction, which is opposite to the tension direction by the solenoid 25, so that the bearing 36 is always kept pressed against the peripheral edge of the circular cam plate 340. .

A magnet 38 is separately attached to the turret disk 13, and each projection lens 6a, 6b is mounted on the lens mount 15 surrounding the turret disk 13.

A reed switch 39a corresponds to the distribution interval of 6C.

39b and 39c are separately provided so that the magnet 38 faces the reed switch corresponding to the projection lens at the projection position, and the reed switch is turned on by the action of the magnet 390, thereby setting the lens at the projection position. The magnification of the projection lens can be transmitted to the display section on the pedestal 4.

each projection lens 5a distributed on the turret disk 13;
The focus adjustment mechanisms 5b and 6c have the configuration shown in FIG. In the figure, 40 is a projection lens 6a, 6b, 6
The focus adjusting driven gear 16a is provided at the inner edge of the upper end of the inner barrel.

15b, 16c are formed, while a helicoid screw 40a which is screwed into the helicoid screw 41a on the inner peripheral surface of the lens barrel 41 is formed on the outer peripheral surface of the middle part of the inner barrel 40, and focus adjustment driven gears 16a, 16b, 16. By rotating the focusing drive gear 19 that meshes with o, the helicoid screw 4Qa,
The inner barrel 40 is moved two degrees in the direction of the optical axis by the lead 41a, thereby adjusting the focus. Lens barrel 4
J is inserted and held in a lens barrel boulder 42 fixed to the back surface of the turret disk 13.

A magnet 43 is provided on the lens switching lever 21, while a bearing 36 provided on this lever 2
When the circular cam plate 340 is disengaged from one engagement U groove (at this time, the worm gear 23 is engaged with the turret gear 12), the lens mount 15 can be close to and face the magnet 43. A reed switch 44 for motor drive control is provided at a predetermined position on the top, and when the lever 21 is rotated counterclockwise by the pulling action of the solenoid 25 and the bearing 36 is released from the engagement U groove, the magnet 43, the reed switch 4
4 is turned on, and as the reed switch 44 is turned on, power is supplied to the motor 22 of the switching drive mechanism 24, and the turret disc 13 is rotated via the worm gear 23 and the turret gear 12, and the circular cam plate is turned on. 34
The bearing 36 that is in sliding contact with the reed switch engages in the next engagement U groove, and the lever 21 rotates back in the clockwise direction where the magnet 43 separates from the reed switch 44 (at this time, the worm gear 23 is connected to the turret gear The motor 22 is kept powered on while the motor 22 is in the trench (the engagement is released from the motor 12).

The focus lever 18 is rotated clockwise by the coil spring 45, that is, the focus adjustment drive gear 19 is moved toward the focus adjustment driven gear 1.
6 a + 16 b + 16 c, and a stepped pin 46 protruding from the lens holder 15 is formed on the free end side of the focus lever 18. It is inserted into the elongated hole, and its free end side is rotatably supported by the stepped pin 46, and at the same time, the rotation range of the υ focus lever 18 is restricted by the stopper action of the stepped pin 46 and the guide elongated hole 47. Then, the anastomosis of the focus adjustment drive gear 19 to the focus adjustment driven gear and the turret gear 1 of the worm gear 23 of the switching drive mechanism 24 are performed.
This allows the anastomoses for the two to be performed smoothly.

Next, a lens switching operation in this enlarged projection apparatus will be explained.

FIG. 5 shows a state in which the projection lens 6a is positioned at the projection position.At this time, the lens switching lever 21
The bearing 36 is engaged in the engagement U groove 35a of the circular cam plate 34 corresponding to the projection lens 6a,
The counterclockwise push of the focus lever 18 by the interference pin 26 is released, and the focus lever 18 is biased by the coil spring 45 to a rotational position where the focus adjustment drive gear 9 meshes with the focus adjustment driven gear 16a. We are expanding. At this time, the magnet 38 on the turret disc 13 is placed opposite the reed switch 39a corresponding to the projection lens 6a [J]. 6a is set at the projection position.

Under the above set state, when a command signal to switch and set the projection lens 6b is input by operating an operation button (not shown) on the pedestal 4, the solenoid 25 is powered on, and the solenoid 25 switches the lens off. The dispensing lever 21 is fully pulled against the tension spring 37. Therefore, the lever 21 is the sixth
Rotate counterclockwise as shown in the figure. Due to the rotational movement, the bearing 36 disengages from the engagement U groove 35a, and the interference pin 26 pushes the focus lever 18, so that the focus adjustment drive gear 19 is disengaged from the focus adjustment driven gear 16a. Then, the worm gear 23 of the switching drive mechanism 24 meshes with the turret gear 12.

At this time, the magnet 43 on the lens switching lever 21 approaches and opposes the reed switch 44, so the reed switch 44 is turned on, and the motor 22 of the switching drive mechanism 24 is activated by the on signal to issue the command described above. Driving is started in the rotational direction according to the signal, and the turret disc 13 begins to rotate in a predetermined direction (in this case, counterclockwise).

Turn on the power to the solenoid 25.
is stopped after a predetermined time set in a timer built into a control circuit (not shown) has elapsed, and the tension of the lens switching lever 21 in the counterclockwise direction by the solenoid 25 is released; however, at this time, the turret As the disc 13 rotates, the bearing 36 disengages from the holding U groove 35a and slides into contact with the periphery of the non-U groove portion of the circular cam plate 34, so that the worm gear 23 and the turret gear 12 are engaged and the focus is adjusted. The engagement of the driving gear 19 with the focal axis driven gear 16a is maintained as it is, and the bearing 36 remains in sliding contact with the periphery of the circular cam plate 34 at the center of the turret (13 maintains the same rotation). .

Projection lens 6bK of circular cam plate 34 phantom engagement U Sho 3
When the rotation of the turret disc 13 progresses until the turret disc 13 reaches the special-effect position of the bearing 36, the 1/lens switching lever 21 rotates clockwise under the action of the tension spring 37, and the bearing 36 or the engaging U While engaging the groove 35b, the worm gear 23 of the switching drive mechanism 24 is connected to the turret gear 1.
2, the turret disk 13 stops, and the projection lens 6b is positioned at the projection position.

Along with this operation, the pressing of the focus lever 18 by the interference bin 26 is also released, so the focus adjustment drive gear 19 meshes with the focus adjustment driven gear 16b. Also, at this time, the magnet 43 on the lens switching lever 21 separates from the reed switch 44, so the reed switch 44
is switched from the previously on state to the off state, ! In response to the ON signal, the motor 22 of the switching drive mechanism 24 stops driving. On the other hand, in this lens set state, the magnet 38 on the turret disc 13 faces the reed switch 39b corresponding to the projection lens 6b, so this reed switch 39b is turned on, and the on signal is used to display the display on the pedestal 4. It is displayed that the projection lens 6b has been switched and set.

Focus adjustment of the projection lens 6b centered at the projection position is as follows:
By fully rotating the focus adjustment dial 31, which partially protrudes above the frame 4, the p1 gear 32, intermediate gear 33, drive transmission gear 27, sprocket 28, chain 30, . The rotation is transmitted to the focus adjustment driven gear 16b via the sprocket 29 and the focus adjustment drive gear 19, and the focus adjustment v shown in FIG.
This is done by moving the projection lens 6b forward and backward in the optical axis direction using the J mechanism.

Effects According to the magnifying projection apparatus of the present invention, the plurality of projection lenses 6a+6b+6c each having a focus adjustment driven gear I6a+16br16c are held at positions equidistant in front of the rotation center, and the rotation Drive gear part for lens switching (turret gear 12) coaxial with center k
A P-digit turret disk 13 and an engagement position in which a focus adjustment drive gear 19 that can be engaged with a focus adjustment driven gear of a projection lens at a projection position are held, and this drive gear 19 engages with the driven gear. A support member (focus lever 18) provided so that the drive gear 19 can move between separate positions separated from the driven gear, and the lens switching drive gear section (
A lens switching drive member (switching drive mechanism 24) that can be engaged with the turret gear 12) and rotates the coolet disk 13 when engaged;
8) and moves the support member (focus lever 18) to a separate position when the interference occurs.
The lens switching drive member (switching drive mechanism 24) and the focus adjustment release member (interference pin 2G) are connected to the drive member ( The switching drive mechanism 24) is n? Before engaging with the lens switching drive gear section (turret gear 12), the focus adjustment release member (interference pin 26) interferes with the support member (focus lever 18), and the focus adjustment driven gear and the focus adjustment Since it is disposed so as to release the engagement with the first-section drive gear 19, an effect similar to being held in the palm of the hand can be obtained.

B. Projection lens switching can be done automatically with a simple button operation, making the operation easier and more convenient to use.

During the lens switching operation, the focal adjustment gear on the operation side is reliably released from the focus adjustment driven gear on the projection lens side, so the load on the lens switching operation is reduced. , the switching operation can be performed with a small driving force, and the motor and other driving members can be downsized.

C. As mentioned above, during the lens switching operation, the focus adjustment drive gear on the operating side and the focus Mi Wj driven gear on the projection lens side are disengaged, so the focus of the projection lens is changed during the lens switching operation. It will not shift and there is no need to adjust it again, making it even more convenient to use.

2. During the focus adjustment operation, there is no need to manually maintain engagement between the focus adjustment drive gear on the operating side and the focus adjustment driven gear on the projection lens side, and then adjust the rotation. Therefore, the operability is improved and the overall usability is greatly improved.

[Brief explanation of the drawing]

1 and 2 are a plan view and a sectional view of a main part of a conventional example, respectively, and FIGS. 3 and 4 are a perspective view and a schematic diagram of a microfilm reader printer to which the enlarged projection device of the present invention is applied, respectively. Figures 5 and 6
Each figure is a front view of the main part of one embodiment, and FIG. 7 is a sectional view of the main part. 2... Carrier, 4... Frame, 5... Light source unit, 6.6a, 6b+6cm projection lens, 7, 8.
10...Mirror, 9...Screen, 11...K
Optical unit, 12... Turret gear (drive gear part for lens switching), 13... Turret disc, 15...
・Lens mount, 16a. 16b, 16c... Focus adjustment driven gear, 18...
Focus lever (support member), 19... Drive gear for focus adjustment, 21... Lever for lens switching ("swinging member"), 22... Motor, 23... Worm gear, 2
4...Switching drive mechanism (lens switching drive member), 25
... Solenoid, 26 ... Interference pin (focus adjustment release member), 31 ... Focus adjustment dial, 34 ... Circular cam plate, 35a + 35b, 35c ... Engagement U groove, 36
...bearing, 40...inner barrel, 41...lens barrel,
42... Lens barrel boulder applicant Minolta Camera Co., Ltd.

Claims (1)

[Claims] An enlargement projection device that enlarges and projects an image on a microfilm by changing the projection magnification by switching and setting a plurality of projection lenses, comprising a plurality of projection lenses each having a focus adjustment driven gear. While holding it in a position equidistant from the center of rotation,
A turret disk provided with a lens switching drive gear portion coaxial with the rotation center, and a focus adjustment drive gear that can be engaged with a focus adjustment driven gear of a projection lens at a projection position are held; a support member provided so as to be movable between a locking position where the driven gear is engaged and a remote position where the drive gear is separated from the driven gear; and a support member that is engageable with the lens switching drive gear section. a lens switching drive member that rotates the turret disk when the lens is in contact with the lens; a focus adjustment M that can interfere with the support member and moves the support member to a separated position when the interference occurs; and a swinging member that carries the material to be removed. , the lens switching drive member and the focus adjustment release member are arranged such that the focus adjustment release member interferes with the support member and becomes a focus adjustment driven gear before the drive member engages with the lens switching drive gear portion. A magnifying projection device characterized in that the device is disposed so as to be disengaged from a focusing drive gear.