JPS60184237A - Control circuit of variable power optical device - Google Patents

Abstract

PURPOSE:To make it unnecessary to increase the capacity of a memory by using a simple polynomial expression determined by characteristic values of an optical system to stop a zoom lens by extension of the length between minimum and maximum magnifications or increase of the number of magnification steps. CONSTITUTION:A console 1 consists of a fixed magnification input key 10 and an optional magnification input key 11, and a detection signal 9A from an unmagnification detector 9, a signal 10A from the fixed magnification input key 10, and a signal 11A from the optional magnification input key 11 are inputted to a control circuit 2. A driving signal 13A which rotates a pulse motor 3 is outputted by signal 12A and 12B from a CPU12. A processing circuit 13, which transmits the position of the zoom lens as an oscillated frequency signal 13B, and a memory 14 are included. A number F of pulses corresponding to a magnification is obtained with a function of an input magnification M in accordance with a polynomial expression 6, and the CPU12 performs this operation to determine the rotation direction of the pulse motor 3 and the number of pulses of movement.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a variable magnification optical device such as a copying machine, and more particularly to a control circuit for a variable magnification optical device of a type capable of varying the magnification to an arbitrary magnification.

Conventionally, A3. A4゜114.
Copy machines designed to change the magnification between JTS standard paper such as 135 and JTS standard (A). There are copying machines that can do this.Such copying machines are generally controlled by a CPU and store movement data corresponding to the magnification value in memory.The number of movement data stored in memory is The first copying machine requires only about 4 or 5 copies, but the second copying machine has a minimum magnification of 0.64 times and a maximum magnification of 1.
If the magnification step is 42 times and the magnification step is 0.01 times, 79 pieces will be required.If the minimum-maximum magnification is further expanded or the magnification step is set to o, 6o+ times, etc., the number will increase and the memory will become full. As the proportion of the memory becomes large, a situation arises in which a large amount of memory must be used.

The present invention has been made in view of the above points, and has a minimum
This invention discloses a control circuit for a variable magnification optical device that does not require an increase in memory size even when the range of maximum magnifications is expanded or the number of magnification steps is increased.

Hereinafter, the present invention will be explained in detail based on the drawings.

FIG. 1 is a schematic diagram showing an example of a variable magnification optical device whose operation is controlled by a control circuit according to the present invention.

In FIG. 1, a control circuit 2 to which a magnification is input by operation 1 is connected to a pulse motor 3, and calculates and controls the rotation direction and rotation speed of the pulse motor 3 according to the magnification input by operation 1; are doing. A gear 4 fixed to the rotation IPIII of the pulse motor 3 meshes with a gear portion of a wire pulley 5.
A zoom lens 8 is fixed to a wire rope 7 wound between a pulley 6 and a pulley 6 to keep the distance between objects constant by a zooming mechanism (not shown), and as the wire rope 7 moves, it moves in the left-right direction in FIG. It is possible.

In addition, in order to set the initial position of the zoom lens 8 at the same magnification position when the power is turned on, the zoom lens 8 is used to detect whether the lens 8 is on the enlargement side or the reduction side with respect to the same magnification position. The detector 9 has a light emitting section 9a and a light receiving section 9b,
The zoom lens 8 is set to the magnifying side depending on whether or not the detection member 8a provided integrally with the zoom lens 8 is interposed between the light emitting section 9a and the light receiving section 9b to block the light beam received by the light receiving section 9b. The same magnification position is determined at the moment when the detection member 8a blocks the light beam or when the detection member is at the light emitting part 9a and the light receiving part 9b. This is the position at the moment when the light beam is received by the light receiving part 9b by retreating from between the
The detection signal from the equal-magnification detector 9 is l (from i level to T,
Falling to change to o level or ■, from 0 level to II
The rising edge that changes to the i level is transmitted to the control circuit 2 as a same-magnification detection signal.

In the variable magnification optical device having the J- configuration, if the zoom lens 8 is not at the same magnification position when the power is turned on, etc. (a drive signal is output from the control circuit 2 based on the detection signal from the f9 detector 9,
This drive signal causes the pulse motor 3 to rotate and the gear 4.
The wire 7 is moved via the wire pulley 5, and the zoom lens 8 fixed to the wire 7 is moved to the same magnification position.

When the zoom lens 8 reaches the equal magnification position, the equal magnification detection signal is output from the equal magnification detector 9, and the drive signal from the control circuit 2 is stopped by this equal magnification detection signal, so that the pulse motor 3
stops rotating, and the zoom lens 8 stops at the same magnification position.

Then, when the operation 11L1 or 1]3 multiplication factor is input, the control circuit 2 calculates the rotational direction and rotation speed of the pulse motor 3, and according to the result of the calculation #-+'i-], the control circuit 2
to move the zoom lens 8 to a predetermined position.

FIG. 2 is a block diagram showing an embodiment of the control system according to the present invention, and the control system shown in FIG.
．． It is composed of a control circuit 2 and a same-magnification detector 9.

Operation 1) [1 consists of fixed magnification input key 10 and arbitrary magnification input key 11, control 4.111 circuit 2 has same magnification detector 9
Detection signal 9A from, fixed input key - signal from IO Jl
A CPTJ+2 and an oscillation circuit which take the signals +IA&input from the OA and the arbitrary magnification person 11, perform calculations according to these input signals, and output a clockwise rotation signal 12A that rotates the pulse motor 3 clockwise and a counterclockwise rotation signal 12B that rotates it counterclockwise. It outputs a drive signal +3A for rotating the pulse motor 3 according to the signals +2A and 12B from the CPU 12, and also transmits the rotation speed of the pulse motor 3, that is, the position of the zoom lens 8 shown in the first figure, to the CPU 2. Oscillation Frequency Signal of the Oscillation Circuit] The processing circuit 13 is configured to transmit the signal as the oscillation frequency signal of the oscillation circuit 313, and the memory 14 is connected to the arithmetic circuit 12.

Here, the calculations performed by CPU+2 will be explained.

The number of pulses F according to the magnification is a function of the input magnification M, and is determined by the polynomial % formula % (1) AO, A4, A2...A,: A constant specific to the lens determined by the moving mouse for the magnification. be able to.

For example, when using a certain lens, F(M)=-2197,5+40+3・M-2605,
5・M"+4128.5・M'-138, small M4...
...(2). Considering the case where the magnification step is set to 0.001 times in this formula (2), M =
Substituting 1.000 and rounding off to the nearest whole number gives F (1,000) = 0. Also, set the minimum magnification to 0.640x and the maximum magnification to 1.
．． When the magnification is 420 times, the number of pulses at the minimum magnification and maximum magnification is F (0,640) = -476 t' (1,420) = 343, and the reduction side is negative and the expansion side is positive with respect to the same magnification position. is expressed as the value of

Note that in equation (2), only the terms up to n = 4 are shown because the terms from n-=5 to -1- do not affect the integer part of the solution.

The CPU+2 performs the above-mentioned calculations, stores the number of pulses F (Ml) that corresponds to the magnification M1 at the current stopped position of the zoom lens 8 at address Δ in the memory 14, and stores the number of pulses F (Ml) at address Δ in the memory 14, and uses the same to calculate the magnification that will be input later. When the magnification F(M2) corresponding to M2 is stored in address B of the memory 14, the calculation of X=F(M2) F(M+) is performed, and the rotation direction of the pulse motor 3 is determined based on the sign of X. Determine the number of moving pulses with IXI.

This number of movement pulses is set to a subtraction counter in the program of the CPU 12.

Next, the operation of the control system shown in the second diagram will be explained using flowchart 1 shown in the third diagram.

When the power is turned on, a detection signal 9A is output from the equal-magnification detector 9, and the CPU 12 outputs a clockwise rotation signal 12A if the detection signal 9A is at II i level, and a counterclockwise rotation signal 12B if it is at ■, θ level. . The processing circuit 13 is the CPU+2
A drive signal 13 is output to the pulse motor 3 in accordance with the signal from the zoom lens 8, and the pulse motor 3 is rotated to move the zoom lens 8. When the zoom lens 8 reaches the equal magnification position, the equal magnification detector is no longer detected, the drive signal 13A is not outputted, the pulse motor 3 stops rotating, and the zoom lens 8 stops at the equal magnification position.

The zoom lens 8 is at the same magnification position, that is, the magnification M, = ], , O
When stopped at position OO, CPU+2 performs calculation according to equation (1) and the calculation result is F (1,000)
is stored in address A of the memory 14.

Next, when the fixed magnification signal 10A or the arbitrary magnification signal 11A is input from the console 1, it is determined whether it is a fixed magnification or an arbitrary magnification.

In the case of a fixed magnification, the CPU], 2 calculates the fixed magnification M2 input later according to formula (1), stores F(M2) in address B of the memory 14, and calculates X=F(M 2 ) −
Perform the calculation F(M,) = (contents of address n) - (contents of address A) to determine whether or not X-0, that is, the magnification M2 input later is the current position where the zoom lens 8 is stopped. If X≠0, which signal to output is the right rotation signal 12A that rotates the pulse motor 3 clockwise or the left rotation signal 12B that rotates the pulse motor 3 to the left depending on the sign of X. The number of moving pulses is determined by IXI, which is the absolute value of X, and set in the subtraction counter in the program.

CI] [When clockwise rotation signal 12A or counterclockwise rotation signal 12B is output from 712, processing circuit 13 outputs signals 12, A
, 12B, and outputs a drive signal 13A that rotates the pulse motor 3 according to 12B, and outputs an oscillation circuit Chusaku Kaiji i♀ vibration frequency signal 13B to the CPIJI 2. CPU] 2
Each time the oscillation frequency signal 13■3 completes one cycle, the subtraction counter in which the number of moving pulses is set is decremented by 1, and when the counter value becomes 0, the signal 12A or 1 is
2B, the drive signal j 3 A from the processing circuit 13 is also no longer output, and the pulse motor 3 stops rotating to complete the movement of the zoom lens 8 to the position corresponding to the magnification M2.

In the case of an arbitrary magnification, the CPU] 2 determines whether the input magnification M2' is within the movable magnification range of the zoom lens 8 based on the arbitrary magnification signal 11, and if it is within the movable range, (1) Perform calculations according to the formula, store F(M2') in address B of the memory 14, and perform the calculation X''F(M2') F(Ml) = (contents of address B) = (contents of address A) Then, the movement of the zoom lens 8 to the position corresponding to the magnification M2' is completed in the same manner as in the case of the fixed magnification.

When the movement of the zoom lens 8 is completed, the CP (112) moves the contents of address B in the memory 14 to address A, and enters a standby state until a new magnification is input.

In the second embodiment, the determination as to whether or not the magnification M at the current position where the zoom lens 8 is stopped and the magnification λ42 input afterward are the same magnification is determined using a polynomial J:
This was done by comparing F(Ml) and F'(M2) after the calculation, but other addresses C in the memory 14 and r)I
Even if the values of Ml and M2 are stored in the RI area and compared with Ml and M2 before performing the calculation using the polynomial, there is no need to particularly increase the memory capacity, so the same effect as the present invention can be achieved. Of course, after the movement of the zoom lens 8 is completed, the contents of address B in the memory 14 are moved to address A and put into a standby state. The calculation to determine the number and direction of moving pulses is performed by storing the data alternately in address and B address. This may be done alternately with (the contents of).

As described above, according to the present invention, a simple polynomial determined by the characteristic values of the optical system is used.

By expanding the range between the minimum and maximum magnification or increasing the number of magnification steps in a variable magnification optical device that can be set to any magnification, there is no need to increase the memory capacity even when the number of steps to stop the zoom lens increases. The effect is great.

[Brief explanation of the drawing]

FIG. 1 shows the operation of the control circuit according to the present invention.
FIG. 2 is a block diagram showing an example of a control system according to the present invention, and FIG. 3 is a flowchart 1 of an embodiment of the present invention. − is. Special fraud applicant Asahi Optical Industry Co., Ltd.

Claims (1)

[Claims] When the power is turned on, a) the first input means inputs the detection signal from the 4::f detector, b) the rotation direction of the pulse motor is determined by the detection signal, and the zoom lens is A first output that outputs either a clockwise rotation signal or a counterclockwise rotation signal when it is not at the double position.
c) Driving means for rotating the pulse motor according to the output of the first determining means d) When the zoom lens stops at the same magnification position, a pulse corresponding to the same magnification position is determined by a polynomial determined by the characteristics of the optical system. When inputting the magnification, f) activating the first calculation means for calculating a number e) the selection means for storing the pulse number corresponding to the same magnification position, which is the output of the first calculation means, in address A of the memory; a second input means for inputting magnification signals from a fixed magnification input key and an arbitrary magnification input key g) a first calculation means h for calculating the number of pulses corresponding to the magnification signal using a polynomial determined by the characteristics of the optical system; ) Selection means for storing the number of pulses corresponding to the magnification signal outputted from the first calculation means at address B of the memory i) memory B? Second calculation means for calculating the difference between the contents of address fi and the contents of address Δ. Determine the rotational direction and number of movement pulses of the pulse motor from the output of the second calculation means, and calculate the clockwise rotation signal and the number of movement pulses. A second determining means that outputs either one of the left rotation signals and subtracts the number of moving pulses to a counter. k) Rotates the pulse generator according to the output of the second determining means and doubles the oscillation frequency. Q) Driving means for outputting 8 to the 21st constant means -"-2
Stopping means for decrementing the γ counter by 1 and stopping the output of the second determining means when the counter value reaches 0 m)-t: When the pulse motor stops, the contents of the memory address B are changed to A? 1. A control circuit for a variable magnification optical device, characterized in that it operates a means for moving the image to the ground.