JP3145202B2 - Optical equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention is, is flange-back adjustment
Regarding possible optical equipment.

[0002]

2. Description of the Related Art Conventional flange back adjustment is performed by an operation knob.
This has been done by transmitting an operating force such as mi by a mechanical mechanism to drive the movable lens back and forth in the optical axis direction. Also, the flange
When performing back adjustment electrically, it is linked to the operation knob etc.
Absolute value output and the flange back adjustment of potentiometer
The adjustment amount (the amount of front and rear drive of the movable lens) is performed in one- to -one correspondence.

[0003]

However, the franc
Jibakku adjusted mechanically when cormorants rows, the outer dimensions of the entire optical apparatus to mechanical interlocking mechanism is required for increases, and the weight also increases. Also, the flange cover
Electrically representative to perform click adjustments, unregulated mode (normal mode
If the operation knob or the like is carelessly moved or moved at the time of (d), there is a disadvantage that the value of the flange back changes at the moment of entering the adjustment mode. Then, when we put a lock mechanism to the operation knob or the like in order to prevent this also be a cost, even worse operability. Further, there is a concern that the lock mechanism may become loose.

An object of the present invention is to provide an optical apparatus having a flange back adjusting device which solves the above-mentioned problems in the conventional example.

[0005]

Means for Solving the Problems To achieve the above object,
In order, in the present invention, moving the one or more lens groups along the optical axis
In the optical equipment that can adjust the flange back by
Adjustment mode setting that allows flange back adjustment is possible
And operating means operated for flange back adjustment
And a flange back memory that stores the flange back value
And the operating means after the adjustment mode is set.
The flange back correction value obtained according to the
To the flange back value stored in the language back storage means
Add and set this added value as the flange back value.
Flange back setting means and this flange back setting
Above based on the flange back value set by the means
Driving means for driving the lens group. like this
By electrically performing the flange back adjustment, a mechanical mechanism is not required, and the external dimensions of the optical device can be reduced and the weight can be reduced. Also, the adjustment mode
Depending on the relative amount of operation of the operating
To determine the Njibakku correction value, no effect is <br/> stomach in the flange back adjusting be moved operation means other than the adjustment mode. The relative operation of the operation means within a predetermined time
Flange back correction value according to the amount (that is, operation speed)
Fine adjustment is easy by asking for
For example, operability is improved.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

<First Embodiment> FIG. 1 is a diagram showing a configuration of a camera as an optical apparatus according to the present invention. In the figure, 11 is a flange back adjustment mode changeover switch, 12 is a flange back adjustment knob (operating means) , 13 is a detector for detecting a change in the flange back adjustment knob 12, and 14 is a counter for counting the output of the detector 13. , 6 inputs the signal of the detector 3, lens signal of the counter 14 as an input and outputs by computing the lens position signal in accordance with a program 5
CPU that calculates and corrects the position command value (flange back
15 ) a memory having a memory 15A for storing the counter value of the counter 14 and a memory for storing the flange back value (flange back storage means) 15B; LCD (display means) for digital display.

The operation of this embodiment in the above configuration will be described with reference to the flowchart shown in FIG. First , the CPU 6 determines whether the flange back adjustment mode changeover switch 11 is in the adjustment mode. If it is not in the adjustment mode, it operates in the normal mode. The normal mode is performed according to the flowchart of FIG. In brief, the CPU 6 includes the focal length setting means 1 and
The focal length set value and the object distance set value set by the object distance setting means 2 are read through the detector 3 , coefficients are read from the memory 4, and the moving lens groups 8a are used by using those values. ８8c are calculated, and a flange back value is added to the result to output a lens position command signal. Then , the lens position control unit 7 and each lens
Each its lens position command signal via the drive unit 9a~9c
The current lens detected by the position detectors 10a to 10c
The lens group to a position signal indicating the position of the group's match
Drive .

On the other hand, when the adjustment mode, operates according to the flowchart of FIG. First , counter 14
Is cleared, and the memory 15 is also cleared. Then, the adjustment knob 12 is rotating, to detect the change in the detector 13,
The output of the detector 13 is counted by the counter 14. Soshi
Then , the value of the counter 14 is stored in the memory 15A, and is used to determine the rotation speed of the adjustment knob 12 at the next sampling.

[0010] Here, when the moving amount of the lens is not related to the rotational speed of the knob 12, that is, as shown in a of FIG. 4
In addition, the total operation amount of the knob 12 during the adjustment mode is
If they are the same, move the lens group regardless of its rotation speed.
When momentum is constant, when the amount of movement of the lens against the rotational speed <br/> of the knob 12 is small, the rotating the knob 12 slightly lens group does not move even little,
Fine adjustment of the flange back can be easily performed.
Even if the rotation speed is increased, the amount of movement of the lens group does not become so large. Also , when the movement amount of the lens relative to the rotation speed of the knob 12 is large, the lens group can be largely moved, but even if the knob 12 is slightly moved, the lens group moves more than necessary, Fine adjustment is very difficult.

[0011] In this embodiment, as an input the value of the counter 14, at this time sampled at CPU6 counter
14 and the counter value stored in the memory 15A (initial value).
Difference d from set value or counter value at previous sampling ) (Relative operation amount within predetermined sampling time interval )
The calculated, to determine the magnitude of the rotational speed of the knob 12 by the magnitude of d, when d is greater is greater, the correction amount of movement of the lens unit so that smaller when smaller (flange
'The d' back correction value) d = Kd ² (K: constant) ... determined by non-linear operation with the square characteristics of (1). And
By changing such as b in FIG. 4 a correction amount of movement of the lens group with respect to the rotational speed of the knob 12, the knob 12 is
As fine adjustment can be easily slowly when rotated by the rotational speed is small, the amount of movement of the lens group is small Do I, also, the amount of movement of the lens groups when the rotational speed is high is rapidly rotating knob 12 And so on,
The amount of movement of the lens group for flange back adjustment is changed not only by the rotation amount of the flange back adjustment knob 12 but also by the rotation speed thereof.

The above-mentioned calculation of the amount of correction movement of the lens group is
When the rotation speed of the knob 12 is low , the movement amount is l ₀ (a value when the movement amount of the lens group is constant regardless of the change speed).
Smaller, if the rotational speed is greater than INO yo if the movement amount is greater than l _0, limited to a quadratic curve shown in b of FIG. 4
Razz, such as lines and exponential curve slope is not zero, have good be performed by an arithmetic expression slope of the curve as the rotation speed <br/> degree increases represent gradually increases as a curve.

[0013] Next, Hula, which is stored in the memory 15B
The Njibakku value, a new flange back values to the memories 15B by adding the correction movement amount d 'calculated earlier (the sum value)
And store again, and LCD (LED or analog)
A new flange back value is displayed in 16. In addition , the flags that are simultaneously stored in the memory 15B
The lens back value is output to the lens position controller 7 to drive the lens group.

[0014] It should be noted that the operation of the knob 12 of the (counter 14
To more accurately constant sampling time of incorporation of the value), but simply the execution cycle of the program as shown in FIG. 2
Instead of performing the sampling in only, but it may also be using a timer interrupt.

[0015] While detecting a digital value the amount of rotation of the <Example 2> Example adjusting knob 12 is 1, which is detected by an analog value, A /
The same effect can be obtained by D-converting and inputting to the CPU. The operation of this embodiment will be described with reference to the flowchart shown in FIG. When the switch 11 is in the adjustment mode, the memory 15 is cleared. Then knob 12 times
Then, the value of the volume (detector) 13 is A / D converted and taken into the CPU 6. Here, the volume 13 is
Contact that rotates in conjunction with the endless rotatable knob 12
The element slides against the circularly arranged resistors.
The positive / negative analog signal from the neutral position of the knob 12
Signal is output. However, they are arranged in a circle.
The area between the two ends of the resistor
Area where the analog signal is not output even if the
Area) .

[0016] Then, the value of the A / D, as will be described later and notes
It shows that 2's complement is taken for the difference d from the value of 15A.
Reset the to FLAG, the most significant bits of the current value of the rotation direction, the knob 12 of the most significant bit of the memory 15A, knob 12, as compared to the order of, for example, the top of the memory 15A
If the bit is 1 (the value of the memory 15A is negative),
Mami 12 rotates in the negative direction (the direction in which the value decreases).
Nevertheless, the contact exceeded the above undetectable area
The most significant bit of the current value of knob 12 is 0 (knob 12
Of the memory 15A and when the current value of the
When the upper bit is 0 (the value of the memory 15A is positive)
The knob 12 rotates in the forward direction (the direction in which the value increases).
Despite of the above,
When the most significant bit of the current value of the knob 12 is 1 (the current value of the knob 12 is
When the current value is negative, the lens group is
It should be driven in the direction corresponding to the rotation direction of 12.
In, to set the above FLAG.

[0017] Then, taking the difference d of <br/> and the values of A / D and memory 15 A, if FLAG is set, positive from (negative taking the two's complement of the difference d Sign is inverted) and
After that, the correction movement amount d 'is calculated using the equation (1).
In this case, the coefficient K used at this time is a negative value. In addition, FLAG
Is not set, the coefficient K is set to a positive value. Next, the corrected movement amount d ′ of the lens group is calculated using the above equation (1).
Calculate. As a result, the knob 12 is rotated in the forward direction.
Lens group rotates in the positive direction and knob 12 rotates in the negative direction
The lens group will be driven in the negative direction.
You. After this calculation, it is performed in the same manner as in the first embodiment. However, the memory 15A stores not the counter value but the A / D value.

[0018]

As described above, in the optical apparatus of the present invention, the flange back adjustment is performed electrically ,
Relative amount of operation of the operating means since the adjustment mode was set
The following effects are obtained because the flange back correction value is obtained according to the following equation .

When the operating means is moved in a mode other than the adjustment mode
Does not affect the flange back adjustment . Also, in the operation means
The need for a lock mechanism is eliminated, and the cost is reduced .

Since no mechanical mechanism is required,
The size and weight of the vessel can be reduced.

The relative operation amount of the operation means within a predetermined time
The flange back correction value based on the
Fine adjustment of the flange back becomes easier and operability is improved.
Up.

The flange back value can be determined at a glance by a display means such as a digital display.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an optical apparatus according to the invention.

FIG. 2 is a flowchart showing an operation of a CPU 6 in the configuration of FIG.

FIG. 3 is a flowchart showing an operation of a CPU 6 in the configuration of FIG.

FIG. 4 shows the rotational speed of the adjustment knob 12 and the flange back compensation.
The figure which shows the relationship with a positive value .

FIG. 5 is a flowchart showing the operation of another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Focal length setting means 2 ... Object distance setting means 3 ... Detector 4 ... Memory 5 ... Program 6 ... CPU 7 ... Lens position control parts 8a-8c ... Lens groups 9a-9c ... Lens driving parts 10a-10c ...
Position detector 11 ... Flange back adjustment mode changeover switch 12 ... Flange back adjustment knob 13 ... Detector 14 ... Counter 15 ... Memory 16 ... LCD

Continuation of the front page (56) References JP-A-5-2204 (JP, A) JP-A-4-221944 (JP, A) JP-A-58-172605 (JP, A) Jikken 47-35205 (JP) , Y1) (58) Field surveyed (Int.Cl. ⁷ , DB name) G02B ⁷ /02-7/105

Claims (6)

(57) [Claims] We claim: 1. There us 1 or more lens groups adjustable optics the flange back is moved in the optical axis direction, it can be set adjustment mode that allows the flange back adjustment
, And the flange back operation means that is operated for adjusting a flange back storage means for storing the flange back values
If, relative to said operating means from the adjustment mode is set
The flange back correction value obtained in accordance with the
Flange back value stored in flange back storage means
And set the added value as the flange back value
A flange back setting means for, flange set by the flange back setting means
Driving means for driving the lens group based on a back value ;
An optical device comprising: 2. The method according to claim 1, wherein the setting of the flange back is performed at a predetermined time.
Depending on the relative amount of operation of the operating means within the interval
Claims wherein a flange back correction value is obtained.
2. The optical device according to 1. 3. The apparatus according to claim 2, wherein
The non-linear calculation using the relative operation amount of the
2. A lung back correction value is obtained.
Or the optical device according to 2. 4. The non-linear operation has a square characteristic.
The optical device according to claim 3, wherein: 5. The method according to claim 1, wherein the flange back setting means is configured to:
The calculated value is stored in the flange back storage means, The driving means is stored in the flange back storage means.
Driving the lens group based on the obtained added value
The optical device according to any one of claims 1 to 4, wherein
vessel. 6. A flange back value as the addition value
2. The display according to claim 1, further comprising a display unit for displaying.
6. The optical device according to any one of 5. to 5.