JPS59128504A - Variable power mechanism of optical device - Google Patents

Abstract

PURPOSE:To obtain a variable power mechanism for a copying machine simple in mechanism and having multifariousness of variable power mode by using a loop mechanism consisting of a driving pulley, rope etc. CONSTITUTION:A motor 44 that is controlled by detected value of an encoder 61 attached to a pulley 40 rotated by a rope 22 is started rotation by setting of a selector switch and a main lens housing is moved by a guide plate 23 through a lever 21. The roller arm 6c of the first additional lens 5 is turned by the crooked part 11 of fixed side wall 13 and the first additional lens 5 is inserted into the optical axis at a position where a click roller 17 engages with other click groove 16. On the other hand, the motor 44 is stopped by output of the encoder 61, and change of variable power is effected.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a variable magnification mechanism for an optical device, and in particular to a magnification change mechanism for an optical device, and in particular, by inserting and removing an additional lens into an optical path in conjunction with the movement of a main lens that moves back and forth along an optical axis, the present invention is capable of adjusting magnification in multiple stages. This paper mainly concerns the improvement of the magnification changing mechanism for digital photographic cameras.

2. Description of the Related Art Hitherto, variable-magnification photocopiers capable of copying originals in large and/or reduced sizes have been commercialized, and the number of variable-magnification stages is increasing. Conventional copying machine magnification mechanisms include those that change the optical path length by moving the imaging lens and mirror in the optical axis direction, and those that change the magnification by moving the imaging lens and an additional lens within the optical path. The main type was the magnification changing type by inserting and removing the lens. In all of these types, microsinches, photo sensors, etc. were used to detect and control the movement position of the optical elements such as the imaging lens. It is not necessary to use a detection means and arrange a detection means for each of the multiple movement positions corresponding to the number of magnification changing stages.As a result, when the magnification changing mode becomes multistage, the detection means becomes more expensive and complicated in proportion to this. Also, if you want to copy at an arbitrary magnification instead of a fixed magnification such as "1B4 to A4" or "B4 to 85,"
In order to achieve this goal, it is necessary to add new detection means and control means or to rearrange them, which has the disadvantage of being difficult to realize.

In order to eliminate these drawbacks, the applicant of the present application first filed a patent application in 1973-3! G70: In a variable magnification type copying machine in which the main lens is moved in the optical axis direction using a rack and binion system, and an additional lens is inserted into and removed from the optical path in conjunction with this, the pinion gear for driving the main lens is We proposed a variable magnification mechanism that uses an encoder to read the rotating angle of the cylinder and controls the drive motor using the output signal from the encoder.

However, increasing the length of the variable magnification stroke in this variable magnification mechanism, which uses a rack-binion system for the main lens drive system, will result in an increase in the size of the drive means, which will interfere with other mechanical elements of the copying machine. This method has the drawback of being subject to various restrictions from the standpoint of design and assembly. In addition, it is difficult to adjust the position between each element of the drive means during assembly, and the active system may be overloaded due to foreign matter getting into the rack and binion, and the motor may be damaged due to failure of the electrical system such as the motor. There were drawbacks such as control failure due to runaway and damage to the drive mechanism.

In addition, in conventional copying machine magnification mechanisms, when controlling the movement of the imaging lens and mirror, the imaging lens drive system and mirror drive system are provided separately, which increases cost and power consumption. The increase in

I was sleeping. This becomes an even more serious drawback as the variable magnification mode becomes multistage.

The present invention has been made in order to eliminate the various drawbacks of the conventional variable magnification mechanism described above, and its first purpose is to provide a new optical device that has a simple mechanism and is easily adaptable to multi-stage variable magnification modes. The object of the present invention is to provide a variable power mechanism.

The λth object of the present invention is to provide a novel magnification change mechanism for an optical device having a safety mechanism against overload and runaway of the drive system.

A third object of the present invention is to provide a variable magnification mechanism for an optical device capable of driving and controlling a plurality of optical elements using seven drive systems.

The first feature of the construction of the present invention for achieving the above object is that it includes a main lens that reciprocates along the optical axis, and an additional lens that is inserted into and removed from the optical path as the main lens reciprocates. a variable magnification optical system consisting of; a positioning means for stopping the reciprocation of the main lens at a predetermined position; and a drive source having a drive pulley for reciprocating the main lens;
An encoder device that outputs a signal indicating the movement position of the main lens in order to control the movement source, and an engagement means that engages with the main lens are provided in an intermediate portion, and the other intermediate portion is predetermined as a drive pulley. The device is constructed of a roof mechanism consisting of a rope that is wound by frictional force and whose other intermediate portion is tightly wound around a position detection pulley attached to the rotating shaft of the encoder device.

Further, the percentage characteristic of another λ-th configuration is an optical device having, in addition to the above-mentioned /th configuration, a conversion means for converting the rotational force of the position/error detection pulley into the driving force of the second driven optical element. It has a variable power mechanism.

According to the present invention having the above-mentioned configuration, compared to the conventional optical device magnification changer Ze7t, it has the advantage of being smaller and simpler, and can easily handle multi-stage magnification changing modes at low cost. Motsu. Further, it has the advantage of being able to drive and control a plurality of driven elements with one drive system, and providing a variable magnification mechanism for an optical device that is advantageous in simplifying the structure, reducing costs, and saving energy.

Embodiments of the present invention will be explained below based on the drawings. As shown in FIG. 7, the variable power mechanism of the optical device of the third embodiment includes a main lens housing 10 having a main lens 1a, a base 1
A rail 4 supported by a device housing (not shown) is fitted in b, and the main lens housing 1 slides on the rail 4 arranged parallel to the optical axis 100 of the main lens 1a. A bearing part 1c is formed in the upper part of the main lens housing 1, and the arm part 6a of the lens frame 6 of the third additional lens 5 and the arm part 8a of the lens frame 8 of the third additional lens 5 are formed in the bearing part 1c.
are each pivotably supported.

The rotation shaft 6b of the arm portion 6a of the third additional lens 56 has a row 2
A roller arm 6C having a diameter of 9 is attached. Similarly, the rotation N+ s- of the arm portion 8a of the first additional lens frame 8
A roller arm 8C having a roller 0 is attached to b. These rollers 9, 10 have bends 11 at their ends.
, 12 {l1ll upper surface 13 of walls 13, 14
a, rolls on 14a.

Similarly, on the upper surface of the main lens housing 1 on the side facing the second additional lens and on the opposite side, there is a third additional lens 5 having the same structure as the above-mentioned third additional lens.

A lens frame 51 having a lens frame 51 is swingably attached.

A click plate 15 having a plurality of click grooves 16 is attached to the not-illustrated housing.

A click roller 17 that engages with the click groove 16 is a click lever that is pivotally supported by a pin 19 installed in the 7 flange 2.
The click lever 18 is always urged by a spring 20 so that the click roller 17 is engaged with the click groove.

Further, a lever 21 is formed on the flange 2, and this lever 21 is attached to a guide plate 23 disposed in the middle of the row 7D22. The rope 22 is fitted into the slot El port 24.The rope 22, which has the guide plate 23 in the middle part via the springs 25 and 26, is connected to the idle pulley 27, 28.
One end thereof is fixed to a point 41 on the periphery of the position detecting pulley 40 via a holder, and is wound around the pulley 40.

On the other hand, the other end of the rope 22 is attached to an idle pulley 29.3.
0, and then a predetermined roll number is applied to a drive pulley 43 having a predetermined diameter so that a predetermined vibration force is obtained, and then a point 42 on the periphery of the position detection boob IJ-40 is applied. It is wound around the pulley 40 so as to be firmly attached to the pulley 40.

The drive pulley 43 is added to the rotational drive shaft of the drive motor 44, and the rope 22 is driven by the rotation of the drive motor 44, causing the guide plate 22 to travel. The guide plate 22 moves the lever 21, so that the main motor vehicle 1 slides on the rail 4.

On the other hand, as the rope 220 is driven by the drive motor 44, the position detection pulley 40 is also rotated. As shown in FIG. is installed.

As shown in FIG.
It also has a binary code track 66 around its outer periphery. The common (→ contact link 65 is connected to the (→ side) of a power supply (not shown) via the printed lead wire on the back side and the H side terminal 67. Also, each track of the binary code track 66 is connected to the Lead wires and (A) side terminals 68 a, 68 b,
68 c.

It is connected to the counter circuit 70 via 68d. A brush contact piece 64 is fixed to the rotating 'kh40a of the position detection pulley, and the brush contact piece 64 is connected to the contact link 65 and the biner 17-code track 6 as described above.
It is configured to slide and rotate on the pulley 6 as the pulley rotates 400 times. With this configuration, Boo IJ-4
The rotation angle amount of 0 is replaced by the rotation angle amount of the brush contact piece 64. Due to its rotational position, the brush contacts 64 are aligned with the surface contacts of each of the binary code tracks 66.
By changing the conduction state with the IH contact link, this conduction -
By counting the non-conducting state with the counter 70, the amount of rotation angle of the pulley 40 is encoded into a λ base number and output. Taking the state shown in FIG. 2 as an example, when the brush contact piece 64 is in the position, it is [1000], when it is in the sun position, it is C/100'3, and when it is in the position C, it is [000θ]. ], and when it is at position D, it is counted as Cl10O], and the counter 70 counts the determination circuit 7.
1 is output. A selection command signal from a magnification selector switch 72 is converted into a co-decimal number by an input encoder 73 and is input to the determination circuit 71 , and is compared with the output from the counter 70 . The drive motor 44 is controlled by a motor control circuit 74 into which the results of the above comparison are input. In this embodiment, when the determination circuit 71 determines that the binary signal from the input side encoder 73 and the binary signal from the counter 70 are the same, it is configured to stop the first rotation of the motor 44. There is.

As described above, the present invention involves winding up the rope 22 with the motor 44, attaching it to the middle part of the rope 22, and moving the main lens housing along the optical axis direction by means of a part of the lever that is engaged with the cut guide plate. During the movement, an encoder device 61 attached to the position detection pulley 40 rotated by the rope 22 detects the movement, and the motor 44 is controlled based on the detected value. On the other hand, the final positioning of the main lens housing 1 is determined by engagement between the click groove 16 of the click plate 15 and the click roller 17.

Now, it is assumed that the position MA of the brush contact piece 64 of the encoder device 60 in FIG. 2 corresponds to the click groove 16a of the click plate 15 in FIG. 3b. Similarly, it is assumed that the position ifr B, the click groove 16b1 position C, the click groove 16c1 position, and the click groove 16d correspond to each other.

Here, by driving the motor 44, the brush contact piece 64 of the encoder 60 rotates at rotation angles PL5 and L from the reference position iA.
2, L3 When rotated, the click roller 17 clicks due to the movement of the main lens housing l.
It is assumed that the robot moves to points A1, A2, and A3 located at distances of l, , 12, and 13 from t 16 a. Then, due to the tension of the spring 20, the groove slope 16'b,
The click roller 17 is reliably engaged with the click grooves 16a, 16b, 16c along 16'c or 16'd. There is a distance L,=4.
There is a relationship of +d L2=42+d L3=63+d. In addition, as shown in FIG. 3a, the above-mentioned d is moved by being in contact with the rear inner surface 24a of the slot opening 24 of the guide plate 23 when the guide plate 23 is stopped. This is the amount of movement of the lever 21 due to inertial force.

Further, as shown in Fig. 3b, when the distance between the center of the click groove 16 and the contact point of the click roller 17 when the motor is stopped is e, if the relationship d - Eliminates runaway due to inertia of the housing 1, and allows the main lens housing to be reliably moved to the 10th position using the click groove.

Next, the operation of the first embodiment will be explained. 1st, 9th
As shown in Figure (A), the click 17 is connected to the click groove 16.
a, only the main lens 1a is on the optical axis 100, and the first additional lens 5 and the third additional lens 7 are engaged with the arm portion 6a,
8a to the outside of the optical axis 100. At this time, the magnification selector switch 72 is set to "equal magnification". Next, set the magnification selector switch 72 to the second @
When set to "reduction" (large reduction magnification), motor 4
4 rotates to run the guide plate 23, and the slot opening 24 of the inner plate 23 pulls the lever 21 to move the main lens housing 1 in the direction of the arrow 51 in FIG. 9. Click groove 16b When the main lens housing 1 moves until the click roller 17 is engaged with the click roller 17, the roller arm 6c of the first additional lens 5 is swung downward by the bent portion 11 of the fixed side wall portion 13.As a result, as shown in FIG. 8), the first additional lens 5 is inserted on the optical axis 100. The motor 44 continues to rotate and then the brush 6 of the encoder 61
4 rotates and moves to position B of the binary food truck 66, and its output signal is encoded by the selector circuit 70 and then input to the determination circuit 71.

On the other hand, for example, if the magnification selector switch 72 is set to the first "reduction" (reduction magnification small), the determination circuit 71 determines that the output from the counter 70 and the output from the input encoder 73 are not the same. Based on the determination, the motor control circuit 74 further rotates the motor 44 to move the main lens housing 1 in the direction of the arrow 51. and,
When the click roller 17 engages with the click groove 16c,
The roller arm 8c of the additional lens 7 is attached to the fixed side wall portion 1.
It is swung downward by the bending portion 12 of No. 4.

As a result, as shown in Fig. fc), the third additional lens 7 is inserted on the optical axis 100 together with the first additional lens 5. In addition, at this time, the brush 64 of the encoder 60 is
c and inputs the signal to the counter circuit 7o,
The counter circuit 7o sends the [oooo] code to the determination circuit 71.

At this time, the determination circuit 71 includes a magnification selector switch 72.
The second “Reduction” set command is F1”
Since the code [oooo] is input through the code 73, the determination circuit 71 determines that both codes are the same code, and the motor control circuit 74 controls the motor 44 to stop.

The other operation of the variable magnification device of the first embodiment is as shown in Fig. G(d). 52, and the third additional lens 21''50 is inserted on the optical axis on the opposite side to the first additional lens 5 and the third additional lens 7.

For example, in a copying machine capable of enlarging and reducing close-up photography, when the eleventh addition lens 5 and the second addition lens 7 are inserted, the reduction optical system is activated, and the third addition lens 5
By forming an enlarging optical system when the o is inserted, an enlarging and enlarging copying machine can be obtained very easily.

As explained in detail above, the present invention provides a main lens housing 1
Since the movement of the rope 22 is performed by the rope 22 wound one time around the driving pulley 43, there is an advantage that there is a high degree of freedom in the running design, and the amount of driving force can be set in advance by the diameter of the driving pulley 43 and the number of turns of the rope 220. When a load or load exceeding the set value is applied, the pulley 43 and the rope 22 are caused to slip, thereby preventing the main lens housing 1 from moving. Furthermore, since both ends of the rope 22 are fixed to the position detection pulley 40 and wound around the pulley 40 from opposite directions, no play or slip occurs between the pulley 40 and the row 122.
The position detection accuracy of the main lens housing is not impaired.

FIG. 3 is a perspective view showing the first embodiment of the present invention.

In describing this embodiment, the same or equivalent damage components as those in the first embodiment described above will be given the same reference numerals and the explanation will be omitted.

The position detection pulley 40 further includes an eccentric cam plate 10.
1 is attached. A roller 107 of an arm member 106 attached to a pedestal 105 of a mirror 104 movable M along the optical axis 100 direction on rails 102, 103 is in contact with the cam surface of the eccentric cam plate 101. Here, the roller 107 is attached to the spring 1 which is held in place by the pedestal 105.
Due to the tension of 08, the eccentric cam 101 is constantly subjected to a force in the direction of contacting the cam surface of the eccentric cam 101. As a result, the eccentric cam 1 is moved simultaneously with the movement of the main lens housing 1 due to the rotational drive of the drive motor 44 and the rotation of the position detecting gear 9-40.
01 is also rotated, so the roller 107 moves the mirror 104 in the direction of the optical axis 100 against the tension of the spring 108.

In this way, in this embodiment, one drive motor 44
This has a harmony that can drive the main lens housing zinc 1 and one driven optical element of the mirror 104.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a first embodiment of the present invention, Fig. 1 is a block diagram showing the arrangement of an encoder and a control circuit, and Fig. 3a
The figure shows the relationship between the lever 21 and the guide device, the IE Jb figure shows the relationship between the click roller and the click board, Figure 9 is a schematic diagram showing the working angle of the embodiment shown in Figure 1, and Figure 5 shows the relationship between the click roller and the click plate. FIG. 1 is a perspective view showing a first embodiment of the present invention. . 1... Main lens housing, 5.7.5o
...Additional lens, 15...Click board, 18...Click click lever, 21...
・・Lever, 22・・Curved loaf 0, 23・・・・
・・Guidance W,, 24・Song・Slot opening, 4
0... Sea IJ for position detection =, 43... Boo for bending section movement! J-144... Drive mtj motor, 61... Encoder device, 101... Four eccentric cam plates, 104... Mirror, 106...
...Arm member. Patent applicant Tokyo Kogaku Kikai Co., Ltd.

Claims (1)

[Claims] /) A variable magnification optical system consisting of a main lens that reciprocates along an optical axis and an additional lens that is inserted into and removed from an optical path as the main lens reciprocates; a positioning means for stopping the reciprocating motion at a predetermined position; a driving source having a driving googly for reciprocating the main lens; and outputting a movement position signal of the main lens to control the driving source. an encoder device having an engaging means for engaging with the nuclear main lens in an intermediate portion, the other intermediate portion being wound around the drive pulley with a predetermined frictional force, and the other intermediate portion being connected to the encoder. 1. A variable magnification mechanism for an optical device, comprising a loop mechanism comprising a rope wound around a Zori for position detection attached to a rotating shaft of the device #. 2) The positioning means has a click member having a click groove formed of a slope inclined with respect to the moving direction of the main lens, and a click roller that engages with the click groove, and is rotated toward the front main lens. 8. A variable power mechanism for an optical device according to claim 7, comprising a freely attached click lever and a suppressing means for pressing the click lever in the full click direction. 3) The engagement means is a guide plate having a longitudinal direction in the running direction of the rope and having a slot opening into which the hook member attached to the main lens is pushed so that it has an amount of play in the running direction. A magnification changer for an optical device according to claim 1 or paragraph Ω, which is characterized in that: g) A first driven optical element consisting of a main lens that reciprocates along the optical axis and an additional lens that is inserted into and removed from the optical path as the main lens reciprocates; a positioning means for stopping at a predetermined position; a driving source having a driving googly for reciprocating the main lens; and outputting a movement position signal of the main lens for controlling the driving arm. an encoder device that engages with the main lens, and an engaging means that engages with the main lens in an intermediate portion; the other intermediate portion is wound around the drive pulley with a predetermined vibration force of N; a loop mechanism consisting of a rope wound around a position detection pulley attached to the rotating shaft of the encoder device; and a conversion means for converting the rotational force of the position detection pulley into the driving force of the Ωth driven optical element. A variable magnification mechanism for an optical device characterized by comprising: Left) The inspection determining means has a click member having a click member formed of a slope inclined with respect to the direction of movement of the main lens, and a click roller that engages with the click groove, and is rotated to the main lens. A magnification changing optical device according to claim 1, characterized in that the optical device is comprised of a movably mounted click lever and a suppressing means for suppressing the click lever in the two click directions. mechanism. 6) The engaging means has a longitudinal direction in the running direction of the rope, and a guide plate having a slot opening into which the hook member attached to the main lens is inserted with an amount of play in the running direction. A variable power mechanism for an optical device according to claim 1 or 3, characterized in that: W) The conversion means includes an eccentric cam plate coaxially attached to the position detection pulley, and an arm member having a roller at one end that comes into contact with the cam surface of the eccentric cam plate, and the Ω-th driven Claims characterized in that the optical element is a mirror member to which the other end of the arm member is attached, which is movable back and forth along the optical axis of the main lens and is tilted with respect to the optical axis. Paragraph 7 of any one of Paragraph G to Paragraph B refers to the variable magnification mechanism of the optical device used in battle.