JP3385621B2 - Prism fixing device, video camera and prism fixing method - Google Patents

Description

Detailed Description of the Invention

[0001]

The present invention relates to, for example, VAP (Var).
The present invention relates to a prism fixing device, a video camera , and a prism fixing method which are suitable for application to a video camera or the like in which a prism such as an iable Angular Prism) element is driven to correct so-called camera shake.

[0002]

2. Description of the Related Art Conventionally, VAP (Variable An)
There has been proposed a video camera in which a camera shake is corrected by using a polar prism) element.

This VAP element is a kind of prism in which two plate glasses are joined by a transparent spring portion which is a bellows, and a viscous liquid is filled inside the spring portion.

This prism is usually arranged in front of a lens that allows light from a subject to enter the CCD element.

The left and right portions of the front glass plate are pivotally supported inside the video camera, and the upper and lower portions of the rear glass plate are pivotally supported inside the video camera.

Further, a position detecting element for detecting the position of the glass sheet is arranged in front of the front glass sheet, and a position detecting element for detecting the position of the glass sheet is arranged above the rear glass sheet.

The axes of the front and rear plate glass are connected to motors for driving in the vertical and horizontal directions, these motors are connected to a drive circuit, and this drive circuit is connected to a microcomputer.

Inside the video camera, an element such as an angular velocity sensor for detecting a change in angular velocity due to camera shake is arranged.

Then, based on the angular velocity data detected by the angular velocity sensor, the microcomputer drives the above-mentioned vertical and horizontal driving motors via a drive circuit to move the above-mentioned front and rear plate glasses in the vertical and horizontal directions. It is made to drive.

The amount of movement of the front and rear plate glass during driving in the vertical and horizontal directions corresponds to the difference between the position detection signal detected by the position detecting element and the microcomputer.

As described above, in the prior art, the angular velocity caused by camera shake is detected, and the drive signal based on the detected angular velocity data and the position detecting element for detecting the vertical and horizontal positions of the prism (VAP element) are detected. According to the difference signal from the position detection signal, the prism is moved in the vertical and horizontal directions to refract the optical axis, thereby correcting the image disturbance due to camera shake.

[0012]

By the way, since the VAP element is formed by joining two plate glasses by a bellows-shaped spring portion and filling the inside of the spring portion with a liquid,
As described above, it is good when the image stabilization is performed by the video camera. However, when the power of the video camera is turned off and the control of the position of the prism is stopped, this VAP is generated when the temperature is 30 degrees due to the characteristics of the liquid. The inside of a video camera equipped with an element (prism) is approximately 40.
Due to this temperature and the own weight of the prism 15, the lower part of the prism 15 is opened more than the upper part, and the prism C has a "H" shape (or vice versa).

If left in this state for a long time, aging (especially under high temperature) will occur.

Once changed, when the power of the video camera is turned on next time, due to the characteristics of the liquid,
The camera shake correction operation is performed with the power-on position as the center position of the prism, that is, the camera shake correction is performed in a state where the characteristics of the prism are significantly deteriorated.

Therefore, the camera-shake correction angle becomes narrow, wasteful power is consumed when the prism is set to the center position when the power is turned on, and the camera-shake correction operation is unnatural because correct servo (in camera-shake correction) is not applied. And other inconveniences occur.

The present invention has been made in view of the above points, and it is possible to prevent the deterioration of the characteristics of the prism due to aging , widen the camera shake correction angle, and perform the correct servo operation, so that the camera shake correction operation can be performed naturally. , prisms fixed device and the video camera arrangement that can and favorably conducted that
It is intended to propose a prism fixing method .

[0017]

The prism fixing device of the present invention is, for example, as shown in FIGS. 1 to 7, a prism 15 and fixing means 12, 20, 21 for fixing the position of the prism 15.
And the control means 9 for controlling the states of the fixing means 12, 20, 21 and the detecting means 22 for detecting the states of the fixing means 12, 20, 21, and the prism 15 by the detecting means 22 when the power is off. When the fixing operation to fix the position of
The point is detected, and from this point of time detected by the control means 9,
The motor 21 is stopped after a lapse of a fixed time so that the position of the prism 15 is fixed at an optimum position.

The video camera of the present invention is, for example, as shown in FIGS.
As shown in FIG. 7, a prism 15, an optical system 16 on which light from a subject is incident through the prism 15, and an optical system 1
Image pickup means 17 on which light from a subject is incident via 6
A signal processing means 18 for processing the image signal from the image pickup means 17, fixing means 12, 20, 21 for fixing the position of the prism 15, and detecting means 22 for detecting the states of the fixing means 12, 20, 21. And fixing means 12, 20, 21
And control means 9 for controlling the state, solid fixing the position of the prism 15 by the detecting means 22 when the power-off
To detect when the constant operation is started, and detected by the control unit 9
The motor 21 is stopped after a predetermined time has elapsed from this point in time so that the position of the prism 15 is fixed at an optimum position. Further, in the prism fixing method of the present invention, in the fixing method of fixing the position of the prism 15 by the fixing means 12, 20, 21, a detecting step of detecting the state of the fixing means 12, 20, 21 and the fixing means 12, 20, 21.
And a control step for controlling the state of the prism, and the position of the prism 15 is fixed by the detection step when the power is off.
To detect when the fixing operation is started, test the control step
After a predetermined time has passed from this point when the motor 21
The prism 15 is stopped and the position of the prism 15 is fixed at an optimum position.

[0019]

According to the present invention described above, the fixed movement for fixing the position of the prism 15 by the detecting means 22 when the power is off.
The time when the work starts is detected and detected by the control means 9.
Since the motor 21 is stopped and the position of the prism 15 is fixed at an optimum position after a predetermined time has elapsed from the point of time, it is possible to prevent deterioration of the characteristics of the prism due to aging.

According to the present invention described above , the position of the prism 15 is fixed by the detecting means 22 when the power is off .
Then, the control means 9 detects the time when the fixed operation starts.
After a predetermined time has passed from this point when the motor 21
Since the prism 15 is stopped and the position of the prism 15 is fixed to the optimum position, deterioration of the characteristics of the prism due to aging can be prevented, and thus the camera shake correction angle can be widened in various video cameras that perform so-called camera shake correction. , The servo can be applied correctly, which allows the camera shake correction operation to be performed naturally and satisfactorily, and the prism is always positioned in the center.
Useless power consumption can be eliminated. Further, according to the present invention described above, the time when the fixing operation for fixing the position of the prism 15 is detected by the detection step when the power is off, and the predetermined time is detected from this time detected by the control step.
Since the motor 21 is stopped and the position of the prism 15 is fixed at an optimum position after a lapse of time, it is possible to prevent deterioration of the characteristics of the prism due to aging and perform so-called camera shake correction.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the prism fixing device, video camera and prism fixing method of the present invention will be described in detail below with reference to FIG . First, an example of a video camera to which the present invention is applied will be described with reference to FIG.

In FIG. 2, reference numeral 15 is a prism, and as shown in the drawing, the plate glass 3 and the plate glass 4 are joined by a transparent spring portion 14a having a hollow inside, and the inside of the spring portion 14a is joined. For example, it is configured by filling a viscous liquid.

A prism having such a structure is generally used as a VAP.
It is called a (Variable Angular Prism) element.

The right and left sides of the plate glass 3 on the front side of the prism 15 are supported inside the video camera by the shafts 3a and 3b of the plate glass 3, and the upper and lower sides of the plate glass on the rear side in the figure of the prism 15 are set on the plate glass 4 respectively. Axis 4
It is pivotally supported inside the video camera by a and 4b.

Also, these shafts 3a and 3b, 4a and 4
Of b, shaft 3a is connected to motor 1 and shaft 4b is connected to motor 2
Connect to.

These motors 1 and 2 are driven by amplifier circuits 7 and 8, respectively.

Reference numeral 5 denotes a position detection circuit for detecting the vertical position of the plate glass 3. The output of this position detection circuit 5 is supplied to the inverting input terminal (-) of the above-mentioned amplifier circuit 7.

Further, 6 is a position detection circuit for detecting the horizontal position of the plate glass 4, and the output of this position detection circuit 6 is supplied to the inverting input terminal (-) of the amplification circuit 8 described above.

A control signal (position command signal) from the microcomputer 9 is supplied to each non-inverting input terminal (+) of each of the amplifier circuits 7 and 8.

The microcomputer 9 includes sensors 10 and 1 such as an angular velocity detecting sensor for detecting an angular velocity.
A control signal obtained by subjecting the detection signal from No. 1 to digital filtering, for example, is supplied to each of the above-mentioned amplifier circuits 7 and 8 as a position command signal.

Therefore, the amplifier circuits 7 and 8 supply the difference between the control signal from the microcomputer 9 and the position detection signals from the position detection elements 5 and 6 to the motors 1 and 2, respectively.

Thus, the image disturbance due to camera shake is corrected by changing the optical axis by the movement of the prism 15, and the corrected light from the subject is passed through the lens 16 to the CCD (charge coupled device) element ( The number of CCD elements is not limited).

The light from the subject photoelectrically converted by the CCD element 17 is supplied to the video camera main circuit 18 as a video signal, and the video camera main circuit 1
After being subjected to various kinds of signal processing at 8, the signal is supplied to, for example, a television monitor (not shown) via the output terminal 19, and is displayed as an image on the tube surface thereof.

As described above, the hand shake is caused by the movement of the hand that supports or holds the video camera so that the light of the subject moves up and down or left and right on the image pickup surface of the CCD element 17, thereby causing the television. This is a phenomenon in which an image on the tube surface of a John monitor moves vertically or horizontally on this tube surface.

Therefore, as described above, if the optical axis is changed and corrected by the prism 15 before the light from the subject is incident on the CCD element 17, the light of the subject on the image pickup surface of the CCD element 17 moves up or down. Can be prevented from moving left and right.

When the vertical correction is actually performed, the motor 1 is rotated to rotate the plate glass 3 in the vertical direction to change the refraction angle of the prism 15, and when the horizontal correction is performed, the motor 2 is rotated. Then, the plate glass 4 is rotated in the horizontal direction to change the refraction angle of the prism 15.

Further, in the figure, 12 is a mechanical lock bar, and this mechanical lock bar 12 drives a motor (not shown) by, for example, the microcomputer 9 to fix the prism 15 in a predetermined state. Is.

That is, in this example, the position of the prism 15 is fixed by the mechanical lock bar 12 when the power of the video camera is turned off.

Now, with reference to FIG. 1, a description will be given of a main part of the above-described video camera according to the present invention, that is, a part for fixing the prism when the power of the video camera is turned off.

FIG. 1 shows a detailed structure of the mechanical lock bar 12 shown in FIG. 2 and a motor and a switch for detecting the state of the mechanical lock bar 12, which are not shown in FIG.

In FIG. 1, the prism 15 (the plate glasses 3 and 4, the spring portion 14a, the liquid 14b filled in the spring portion 14a) is replaced by the plate glass 3 and 4 of the prism 15.
Are covered with plastic covers 15a and 15b, respectively.

The shape of the inner portion of the mechanical lock bar 12 is made to match the upper portion of the prism 15 as shown in the figure, and further, the mechanical lock bar 12 is formed so that the approximate middle portion of the mechanical lock bar 12 is the apex. In the figure, make the angle of the front part and the back part different.

Further, a cam receiving projection 12a is formed inside the intermediate portion which is the apex of the mechanical lock bar 12, and a claw 12b is formed inside the rear portion in the figure.

Then, as shown in the figure, the mechanical lock bar 1
The cam 20 is brought into contact with the second cam receiving projection 12a, the motor 21 is connected to the cam 20, and the motor 21 is driven by the microcomputer 9.

Further, for example, the mechanical lock bar 1 is attached to the claw 12b.
The leaf switch 22 for detecting the position of 2 is brought into contact with the leaf switch 22, one end of the leaf switch 22 is connected to the input terminal of the microcomputer 9, and the leaf switch 22 and the input terminal of the microcomputer 9 are connected. The connection point is connected to the power supply terminal 23 via the resistor R1.

The microcomputer 9 has a driver for driving the motor 21, for example.

FIG. 3 is an explanatory view illustrating each part of FIG. 1 in an easy-to-understand manner.

As shown in FIG. 3, the mechanical lock bar 1
2 is the state of this figure (when fixed: "fixed" indicated by the arrow in the figure)
Side), the leaf switch 22 is opened, so that the signal level supplied to the microcomputer 9 (see FIG. 1) becomes a high level "1" by the pull-up resistor R1.

At this time, the control signal supplied from the microcomputer 9 to the motor 21 via the two control lines shown in FIG. 1 is at the high level "1".

On the other hand, when the system power supply of the video camera is turned off, one of the control signals supplied from the microcomputer 9 to the motor 21 via the two control lines shown in FIG. 1 ", and the other becomes low level" 0 ".

As a result, the motor 21 is driven, whereby the cam 20 rotates in the direction of the arrow indicated by x in the figure, and the tip of this cam 20 pushes up the cam receiving projection 12a,
As a result, the mechanical lock bar 12 rotates to the "open" side indicated by the arrow in the figure.

By pushing up the front part of the mechanical lock bar 12, the mechanical lock bar 1
The rear portion of 2 (the right side portion of the cam receiving projection 12a in the figure) rotates downward, and the tip portion thereof, that is, the claw 12b presses the leaf switch 22.
Turn on.

Therefore, at this time, the signal supplied to the microcomputer 9 becomes the low level "0".

As shown in FIG. 4, the output signal of the leaf switch 22 has a high level "1" when fixed and a low level "0" when opened. Therefore, when the motor 21 is continuously driven, the output signal shown in FIG. As shown, high level "1" and low level "0" outputs are obtained alternately.

As shown in FIG. 3, one end of a spring 24 indicated by a broken line is attached to the upper end of the rear portion of the mechanical lock bar 12, and the other end of the spring 24 is attached to, for example, the housing of a video camera. May be.

When the spring 24 is attached in this way,
When the motor 21 is not driven, the mechanical lock bar 1
The tip of the rear part of 2 is pulled upward in the figure,
The mechanical lock bar 12 rotates to the fixed side.

On the other hand, when the motor 21 is driven, the drive power of the motor 21 causes the cam 20 to rotate in the direction of the arrow x, and the tip end of the cam 20 pushes up the cam receiving projection 12a, whereby the mechanical lock bar. The front portion of 12 rotates to the open side, and the rear portion of the mechanical lock bar 12 rotates downward to press the leaf switch 22 and turn on the leaf switch 22.

Next, the detailed operation of the fixing device will be described with reference to the flowchart of FIG.

First, in step 100, it is judged whether or not a system power switch (not shown) is turned on, and "YE
If “S”, the process proceeds to step 110.

In step 110, the motor 21 is driven. Then, the process proceeds to step 120.

That is, one of the two control signals supplied from the microcomputer 9 to the motor 21 via the two control lines (see FIG. 1) is set to the high level "1" and the other is set to the low level "0". To

In step 120, the leaf switch 22
It is determined whether or not the rising edge of the output is detected, and if “YES”, the process proceeds to step 130.

That is, the output of the leaf switch 22 shown in FIG. 4 shifts from low level "0" to high level "1",
That is, it is detected that the mechanical lock bar 12 shifts from the open state to the fixed state.

Therefore, when it is detected that the mechanical lock bar 12 shifts from the fixed state to the open state, the output of the leaf switch 22 shifts from the high level "1" to the low level "0", that is, the leaf switch. The fall of the output of 22 may be detected.

In step 130, a wait timer (not shown) is started. And step 14
Move to 0.

That is, the timer in the microcomputer 9 is started, and in step 120 the leaf switch 2
The time is measured from the time when the rising edge of the output 2 is detected.

This measurement time is the time required for the mechanical lock bar 12 to completely fix the prism, for example, 100 m.
/ S to 300 m / s.

This corresponds to the leaf switch 2 in FIG.
Rather than stopping the motor 21 and fixing the prism 15 by the mechanical lock bar 12 at the rising of the output of 2, that is, the mechanical lock bar 12, the motor 21 is stopped at the time p2 measured by the weight timer for a certain time and the mechanical lock bar 1
This is because fixing the prism 15 by 2 allows the prism 15 to be fixed in a more completely fixed state.

In step 140, it is judged whether or not the wait timer is over, and if "YES", step 1
Move to 50.

In step 150, the motor 21 is stopped. And it ends.

As a result, the mechanical lock bar 12 stops at the optimum position for fixing the prism 15, and the prism 15
Can be fixed in an optimal state.

Thus, in this example, the motor 21
Also, the cam 20 is driven by the microcomputer 9 so as to perform the fixing operation or the opening operation of the mechanical lock bar 12 with respect to the prism 15, and when the fixing operation is performed, the leaf switch 22 is used to set the time when the fixing operation starts. Since the motor 21 is detected and the motor 21 is stopped after a predetermined time has elapsed from this detected time,
It is possible to prevent the deterioration of the characteristics of the prism due to aging, so that in various video cameras that perform so-called camera shake correction, the camera shake correction angle can be widened and correct servo can be applied, which allows the camera shake correction operation to be natural,
In addition, it can be satisfactorily performed, and since the prism is always positioned in the center, useless power consumption can be eliminated.

FIG. 6 shows the cam 20 and the motor 2 shown in FIG.
This is an example in which a plunger 30 is used in place of 1. In the following description with reference to FIG. 6, parts corresponding to those in FIG.

In FIG. 6, reference numeral 27a denotes an arm. The left end of the arm 27a is brought into contact with the lower portion of the cam receiving projection 12a of the mechanical lock bar 12, and the right side portion of the arm 27a is supported by the member 27b. The magnetic body 25 is attached to the lower portion, one end of a spring 26 is attached to, for example, a substantially central portion of the arm 27a, and the other end of the spring 26 is attached to, for example, a housing of a video camera.

28 is a coil.
The coil 28 is wound around 8a, one of the coils 28 is connected to one of the input terminals of the microcomputer 29 not shown, and the other of the coils 28 is connected to the other input terminal of the microcomputer 29 not shown.

When a current is supplied to the coil 28 from the microcomputer 29, the iron core 28a is magnetized, whereby the magnetic body 25 attached to the arm 27a is attracted, and the arm 27a rotates downward with the member 27b as a fulcrum. As a result, the cam receiving projection 12a of the mechanical lock bar 12 moves as indicated by arrow p3 in the figure.

Thus, the front portion of the mechanical lock bar 12 rotates upward as indicated by arrow p4 in the figure, and the rear portion of the mechanical lock bar 12 in the figure indicates arrow p in the figure.
As indicated by 3, the prism 15 is unlocked by the mechanical lock bar 12, that is, the prism 15 is opened.

At this time, from the leaf switch (not shown) (having the same configuration as in FIG. 1), the claws of the mechanical lock bar 12 press the leaf switch to turn it on, as described in FIG. , A low level “0” signal is supplied to the microcomputer 29.

On the other hand, when the current supply to the coil 28 of the microcomputer 29 is stopped while the prism 15 is open, the iron core 28a is in a non-magnetized state, so that the force pulling the magnetic body 25 is lost.
As a result, the urging force of the spring 26 causes the arm 27a to rotate about the member 27b as a fulcrum in the direction indicated by the arrow p4 in the figure.

As a result, the left end of the arm 27a pushes up the tip of the cam receiving projection 12a of the mechanical lock bar 12, whereby the front portion of the mechanical lock bar 12 in the figure rotates in the direction indicated by the arrow p3 in the figure, and The rear portion of the mechanical lock bar 12 in the figure rotates in the direction indicated by arrow p4 in the figure.

Therefore, the prism 15 is the mechanical lock bar 1
2 and the pawl 12b at the rear portion of the mechanical lock bar 12 is separated from a leaf switch (not shown), whereby the leaf switch is turned off, and the signal supplied from this leaf switch to the microcomputer 29 is shown in FIG. The high level becomes "1" in the same manner as.

As described above, in this example, the plunger 30 is driven by the microcomputer 29 to perform the fixing operation or the opening operation of the mechanical lock bar 12 with respect to the prism 15, so that the characteristics of the prism due to aging change. Deterioration can be prevented, so that in various video cameras that perform so-called image stabilization, the image stabilization angle can be widened and correct servo can be applied,
As a result, the camera shake correction operation can be performed naturally and satisfactorily. Further, since the prism is always positioned in the center, it is possible to eliminate unnecessary power consumption.

FIG. 7 shows an example in which a piezoelectric element 31 is used instead of the leaf switch 22 of the fixing device described in FIG.

Hereinafter, description will be made with reference to FIG. 7. In FIG. 7, portions corresponding to those in FIG. 1 are designated by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 7, the left end of the piezoelectric element 31 is brought into contact with the tip of the claw 12b in the rear portion of the mechanical lock bar 12 in the figure, and the right end of the piezoelectric element 31 is fixed to the fixing member 32.
Attach to.

The output terminal of the piezoelectric element 31 is connected to the amplifier circuit 33.
To the input terminal of the microcomputer 34, and the ground end of the piezoelectric element 31 is grounded.

This microcomputer 34 has, for example, an A-D converter for converting an analog signal from the above-mentioned piezoelectric element 31 into a digital signal, and the input terminal of this A-D converter is the input terminal of the above-mentioned microcomputer 34. Be connected to.

Now, as shown in this figure, the motor 21 and the cam (see FIG. 1) or the plunger 30 described above.
When the front portion of the mechanical lock bar 12 is rotated upward by (see FIG. 6) (all of which are not shown in FIG. 7), the piezoelectric element 31 causes the pawl of the rear portion of the mechanical lock bar 12 to rotate. It is pressed and deformed by 12b, and as a result, for example, several 10
With the output of mV, this mechanical lock bar 12
Thus, the prism 15 is fixed.

The output from the piezoelectric element 31 is supplied to the microcomputer 34 via the amplifier circuit 33, and the microcomputer 34 AD (not shown) is shown.
Converted to digital data by the converter.

As in the fixing device described with reference to FIG. 1, the motor or the like is stopped when a predetermined time is measured from the time when this data is detected or when the output from the piezoelectric element 31 reaches a predetermined value. The mechanical lock bar 12 holds the prism 15 fixed.

On the other hand, when the motor or the like is further driven from this state, the front portion of the mechanical lock bar 12 rotates downward, and the rear portion of the mechanical lock bar 12 rotates upward. 31
Returns to its original shape where no pressure is applied, and no voltage is output from this piezoelectric element 31.

In this example, since the piezoelectric element 31 is used instead of the leaf switch 22, the prism 15
Can be determined by detecting a direct value, not time, from the start of fixing and the time of fixing at the best position.

As described above, in this example, the motor 21
The plunger 30 is driven by the microcomputer 29 to perform the fixing operation or the opening operation of the mechanical lock bar 12 with respect to the prism 15, so that it is possible to prevent the deterioration of the characteristics of the prism due to aging, and thus the so-called camera shake correction. In various video cameras that perform the same, the camera shake correction angle can be widened, and the servo can be correctly applied. Therefore, the camera shake correction operation can be performed naturally and satisfactorily. Therefore, useless power consumption can be eliminated.

In each of the above examples, the mechanical lock bar 12 and the mechanism for driving the mechanical lock bar 12 are
Although the example in which the mechanical lock bar 12 and the mechanism for driving the mechanical lock bar 12 are provided respectively, for example, the mechanical lock bar 12 and a plurality of mechanisms for driving the mechanical lock bar 12 are fixed in both vertical directions (2 sets), and vertical and horizontal directions (4 sets or 1 set) One set may be fixed in two directions at the same time).

The above-described embodiment is an example of the present invention, and it goes without saying that various other configurations can be adopted without departing from the gist of the present invention.

[0096]

According to the present invention described above, the fixing operation for fixing the position of the prism by the detecting means when the power is off.
At this time, the time when the
Since the motor is stopped and the position of the prism is fixed at an optimum position after a predetermined time has passed from the point, there is an advantage that the deterioration of the characteristics of the prism due to secular change can be prevented.

Further, according to the present invention described above, the fixed movement for fixing the position of the prism by the detecting means when the power is off.
This is detected by the control means by detecting the time when the work starts.
Since the motor is stopped and the position of the prism is fixed at an optimum position after a predetermined time has elapsed from the time , it is possible to prevent deterioration of the characteristics of the prism due to aging, and thus various video cameras that perform so-called camera shake correction. In this case, the camera shake correction angle can be widened and the servo can be correctly applied, which allows the camera shake correction operation to be performed naturally and satisfactorily. Furthermore, since the prism is always positioned in the center, it is useless. There is a benefit that can eliminate unnecessary power consumption. Further, according to the present invention described above, the time when the fixing operation for fixing the position of the prism is detected by the detection step when the power is off, and the predetermined time has elapsed from this time detected by the control step.
After that, the motor 21 is stopped and the position of the prism is fixed to the optimum position. Therefore, there is an advantage that the deterioration of the characteristics of the prism due to aging can be prevented and so-called camera shake correction can be performed.

[0098]

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a main part of an embodiment of a prism fixing device and a video camera of the present invention.

FIG. 2 is a configuration diagram showing an example of a video camera to which the present invention is applied.

FIG. 3 is an explanatory diagram of a main part of an embodiment of the prism fixing device and the video camera of the present invention.

FIG. 4 is a timing chart for explaining an embodiment of the prism fixing device and the video camera of the present invention.

FIG. 5 is a flowchart for explaining an embodiment of the prism fixing device and the video camera of the present invention.

FIG. 6 is a configuration diagram showing another example 1 of the essential parts of one embodiment of the prism fixing device and the video camera of the present invention.

FIG. 7 is a configuration diagram showing another example 2 of the essential parts of one embodiment of the prism fixing device and the video camera of the present invention.

[Explanation of symbols]

1, 2 motor 3, 4 plate glass 5, 6 Position detection element 7, 8 amplifier circuit 9 Microcomputer 10, 11 sensor 12 Mecha Lock Bar 14a spring part 14b liquid 15 prism 16 lenses 17 CCD element 18 Video camera main circuit 19 output terminals 20 cams 21 motor 22 Leaf switch 23 Power terminal 24 springs R1 resistor

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-2-111174 (JP, A) JP-A-4-142175 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04N 5/232 G02B 5/06 G02B 27/64

Claims (3)

(57) [Claims] 1. A prism, a fixing means for fixing the position of the prism, a detecting means for detecting the state of the fixing means, and a control means for controlling the state of the fixing means, and when the power is off. The time when the fixing operation for fixing the position of the prism is detected by the detection means , and after a predetermined time has elapsed from this time detected by the control means ,
A prism fixing device characterized in that the motor is stopped to fix the position of the prism at an optimum position. 2. A prism, an optical system in which light from a subject is incident through the prism, an image pickup unit in which light from the subject is incident through the optical system, and a video signal from the image pickup unit. Signal processing means for signal processing, fixing means for fixing the position of the prism, detection means for detecting the state of the fixing means, and control means for controlling the state of the fixing means. Sometimes the detecting means detects the time when the fixing operation for fixing the position of the prism starts , and after a predetermined time has elapsed from this time detected by the control means.
A video camera characterized in that the motor is stopped to fix the position of the prism at an optimum position. 3. A fixing method for fixing the position of a prism by a fixing means, comprising a detecting step for detecting the state of the fixing means and a control step for controlling the state of the fixing means, and when the power is off. The detection step detects the time when the fixing operation for fixing the position of the prism starts , and a predetermined time has elapsed from this time detected by the control step.
After that, the motor is stopped and the position of the prism is fixed to an optimum position.