JP2642269B2 - Surgical microscope focusing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a focusing device having an in-focus state detecting function in an operating microscope.

[0002]

2. Description of the Related Art In recent years, microsurgery for performing surgery under a microscope has been developed and spread, and is performed in various departments including ophthalmology and brain surgery. The microstrip Kurosajari is used stereomicroscope, the surgeon performs the surgery while stereoscopic image within the field of view, a surgical site That observation site to change outside the field of view, once by moving the position of the microscope After the positioning, it is necessary to perform the focusing operation on the operation part again. In particular, in brain surgery, smoothness and ease of such a positioning operation and focusing operation of the microscope are required, and reduction of the operation time is desired.

In order to satisfy the above demand, Japanese Patent Laid-Open No.
Japanese Unexamined Patent Publication No. 847 discloses a lifting device, a support arm, and a gantry device that change the orientation position or the angular position of a surgical microscope with a well-balanced state and a light operating force. In addition, Japanese Patent Publication No. 57-55123 and
Japanese Patent Application Laid-Open No. 7-158826 discloses that, in order to improve the focusing operation of a surgical microscope, an index is projected on an object surface as an active type, reflected light is detected by a light receiving element, and focusing control is performed based on the detection signal. An apparatus for performing the above is disclosed. Further, Japanese Patent Application Laid-Open No. 57-158826 discloses a focusing control device which can be turned on / off by a surgeon's switch operation as a focusing control device selected by the surgeon. This device can be used by switching between two modes, a mode in which focus control is always performed in accordance with focus detection, and a mode in which a switch is operated when the operator needs it to perform focus control. I have. In addition, 2-63
No. 206, the index means is provided in the operation section, the index is detected in the microscope optical system of the mirror section, the focusing is controlled based on the index, and the correction of the focus state with respect to the position change of the microscope is further performed. An apparatus for performing is disclosed.

[0004]

In the above-mentioned prior art, each of the focusing control devices is either in a focusing operation mode, a mode for operating the position correcting means, or a mode for operating only when the operator operates the switch. Operation mode is selected. Normally, the operator needs focusing control or focusing control during the operation after manipulating the position of the microscope when changing the observation site, that is, when changing the treatment site. As disclosed in the related art, in a surgical microscope, when the focus control is operated during the operation of the lens barrel position, the operability deteriorates. Therefore, when the operator moves the position of the microscope during the operation, the operator has to operate the focus control operation switch after performing a certain degree of focus and positioning, and the operation is complicated. In addition, in the conventional configuration in which the operation unit is provided with index means and the focus and position control is performed by detecting the index in the mirror unit, the index means must be provided in the operation unit. For example, if there is an operative site deep inside the body cavity and the operative site advances deeper into the body cavity as the operation proceeds, the positional relationship between the observation site, which is the operative site, and the index will not be clear, and an accurate focus state will be achieved. Can not keep.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems. It is an object of the present invention to automatically perform a focusing operation after positioning a mirror body, and to always provide an accurate focusing state. It is to provide a surgical microscope focusing device which can be obtained.

[0006]

According to the present invention, there is provided a surgical microscope focusing apparatus comprising: a lens body position operation detecting means; a focusing means for performing focusing control in accordance with an output of the lens body position operation detecting means;
Is provided.

[0007]

The lens body position operation detecting means monitors the position movement state of the lens body part, and outputs a lens body position movement operation end signal to the focusing means when the operator stops moving the lens body part position. . The focusing means operates the distance measuring means based on the end signal to perform focusing control.

[0008]

Embodiments will be described below with reference to the drawings. FIG.
1 is an external view of a surgical microscope having a focusing device according to a first embodiment of the present invention. In the figure, reference numeral 1 denotes a gantry, 2 denotes a first arm rotatably supported on a gantry 1 around a vertical axis Oa, and 3 denotes a first arm 2 rotatably supported around a vertical axis Ob. The raised pendant arm 4 is supported by the other end of the pendant arm 3 so as to be rotatable around an axis Oc. Is a mirror body rotatably supported by the camera, 6 is a lens barrel, and 7 is a handle. A non-exciting operation type electromagnetic brake 4 for adjusting and fixing the observation direction of the mirror body 5 is provided on two rotation axes in the elevation operation arm 4.
a, 4b (not shown) are attached, and the operation of the electromagnetic brakes 4a, 4b is performed by turning on / off a switch 8 provided on the handle 7. On the other hand, focusing operation and zooming operation of the microscope are performed by turning on / off a foot switch 9 (not shown) placed at the foot of the operator.
This is performed by the FF operation.

FIG. 2 is an arrow view of a pair of left and right stereoscopic observation optical systems of the surgical microscope viewed from a plane including right and left optical axes. In the figure, P is a surgical site, 11 is a common objective lens,
Numeral 12 denotes a variable power optical system disposed behind the common objective lens 11, and 13 and 14 denote erecting porro prisms disposed on the optical axis of the variable power optical system 12 and arranged in a pair on the left and right in the lens barrel 5. And eyepieces.

FIG. 3 is a diagram viewed from within a plane (II section) including the photometric optical axis O in FIG. 2 and perpendicular to the paper surface. In the figure,
Reference numerals 10 and 15 denote lenses, 16 denotes a dichroic mirror that transmits infrared rays and reflects visible light, 17 denotes a condenser lens, 18 denotes an aperture for setting an illumination field in the operation site P, 19
Is an illumination lamp, 28 is an infrared light emitting diode, and 29 is a two-segment PD having two infrared light receiving elements. Since the infrared light emitting diode 28 is disposed at the focal position of the lens 15 and the focus position of the illustrated observation optical system is the front focal position of the objective lens 11, when in the focused state,
The infrared light emitting diode 28 is at a conjugate position with respect to the operation site P. Further, the two-divided PD 29 is disposed at the rear focal position of the lens 10, and when the image of the infrared light emitting diode 28 is in a focused state, it is formed with an equal area with respect to each light receiving element of the two-divided PD 29. At the same time, the image is formed so as to be deviated on one of the light receiving elements when the front and rear pins are in the focused state, that is, the center position of the infrared light emitting diode 28 and the center position of the two-part PD 29 are optically coincident. It is arranged to be.

FIG. 4 is a circuit block diagram of the power supply section 20 of the focusing apparatus according to the present embodiment. In the drawing, reference numeral 21 denotes a drive circuit which receives a contact signal from a switch 8 provided on the handlebar 7 and outputs a drive signal to the electromagnetic brakes 4a and 4b and outputs an electromagnetic brake operation signal Br to a light emitting circuit 25 described later. Is a focusing drive circuit that receives a focusing operation signal from the foot switch 9 and outputs a focusing drive signal to the focusing motor 5a built in the elevation operation arm 4; A variable power drive circuit for outputting a variable power drive signal to a variable power motor 5b built in the raising / lowering operation arm 4 is provided for automatically performing a focusing operation after the operator changes the position of the mirror body 5. Light emitting circuit 25, light receiving circuit 2
6 is a focusing control unit composed of a distance measurement arithmetic circuit 27.

Referring to the circuit block diagram of the focusing control section 30 shown in FIG. 5, the light emitting circuit 25 includes a logic circuit 25a and a control circuit 25b.
The logic circuit 25a receives the electromagnetic brake operation signal Br.
Is detected, and the end of the position movement operation of the mirror 5 is detected from the potential, and the control circuit 25b detects the logic circuit 25a.
In response to the operation end signal detected in the step (1), a diode light emission signal Ra is output to the infrared light emitting diode 28, and a synchronization signal As is output to the light receiving circuit 26 and the distance measurement operation circuit 27. The light receiving circuit 26 is divided into two parts P
D29, the detection signals Va output from the two light receiving elements,
It comprises an amplifier circuit 26a that receives Vb and amplifies and outputs the detection signal, and a switch circuit 26b that receives a synchronization signal from the control circuit 25b and controls the output timing of the amplifier circuit 26a. The ranging calculation circuit 27 calculates the sum and difference of the hold circuit 27a to which the amplified detection signals Va and Vb are input and operates according to the synchronization signal As, and the detection signals Va and Vb output from the hold circuit 27a. An addition circuit 27b and a subtraction circuit 27c which respectively output the operation, and (Va-Vb)
A division circuit 27d that divides / (Va + Vb) and outputs a signal, and a determination that the focus state is detected and determined according to the output value of the division circuit 27d and the focusing operation signal Vc is output to the focusing drive circuit 22. And a circuit 27e.
The power supply unit 10 is built in the gantry 1.

Next, the operation of this embodiment will be described with reference to the timing chart shown in FIG. With the above configuration, the mirror 5 of the surgical microscope is supported so as to be spatially movable,
When the operator turns on the switch 8 while holding the handle 7 to change the observation field of view, the electromagnetic brakes 4 a and 4 b built in the elevation operation arm 4 are turned off, and the mirror body 5 is turned off.
Can be operated and adjusted. And mirror 5
When the operator turns off the switch 8 after the positioning, the electromagnetic brakes 4a and 4b are turned on, and the position of the mirror body 5 is fixed. At this time, the logic circuit 25a of the light emitting circuit 25
In the above, the end of the position movement operation of the mirror body 5 is detected from the potential change of the electromagnetic brake operation signal Br output from the drive circuit 21, and accordingly, the control circuit 25b causes the infrared light emitting diode 28 to emit light. It outputs Ra and a synchronization signal As (see FIG. 6). Light receiving circuit 26
In the amplifier circuit 26a, the detection signals Va and Vb output from the two-divided PD by the light emission of the infrared light emitting diode 28
And amplifies this signal to obtain the synchronization signal A from the switch circuit 26b.
Output according to s.

In the distance measurement operation circuit 27, the addition circuit 27b and the subtraction circuit 27c are input in response to the input of the detection signals Va and Vb.
The division circuit 27d calculates the detection signals Va and Vb, and the determination circuit 27e detects the direction of the focus shift from the sign of the calculation result. Then, a focusing operation signal Vc is output to the focusing drive circuit 22 to correct the out-of-focus state, and the focusing drive circuit 22 drives the focusing motor 5a according to the focusing operation signal Vc. It is always automatically shifted to the correct focus state.

As described above, according to the present embodiment, the operator does not need to adjust the focus when the position of the operation part is adjusted by changing the observation site during the operation, and the operation part is kept in a sharp focus state. Observation becomes possible. Therefore, the operator can concentrate on the operation, which is effective for performing the operation safely. In the present embodiment, an XY drive device for performing two-dimensional horizontal movement is installed instead of the elevation operation arm 4,
Thus, even when the mirror 5 is configured to be moved, the above-described effect can be realized by performing the focusing control at the end of the operation of the XY driving device. Further, in the present embodiment, when the vertical electric coarse movement device is combined with the gantry 1 or the like, the logical sum (OR) of the operation signal of the vertical electric coarse movement device and the electromagnetic brake operation signal Br can be obtained. Thus, the end of the coarse operation can be detected.

Next, a second embodiment will be described with reference to FIGS. The same members as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. In FIG.
An acceleration (not shown) for detecting acceleration in a direction indicated by an arrow a in the figure, that is, a direction perpendicular to a pair of left and right observation optical axes in the observation optical system shown in FIG. A sensor 41 is provided. The mirror body 39 is supported by each arm such as the elevation operation arm 4 so as to be spatially movable as in the first embodiment.

FIG. 8 is a circuit block diagram of the power supply section 40 of the second embodiment. In the figure, reference numeral 42 denotes an amplification circuit to which an acceleration sensor 41 is connected for amplifying an acceleration detection signal from the acceleration sensor 41, and reference numeral 43 denotes an amplification output signal from the amplification circuit 42 (hereinafter, referred to as "amplification output E"). And a comparator circuit (not shown) for detecting a zero-cross point of the amplified output E and inverting the output state of the signal, and a pulse signal (hereinafter, referred to as “inversion”) when the output signal of the comparator circuit changes (inverts). A zero-cross detection circuit 44 composed of a pulse circuit (not shown) for outputting a pulse output C ”) integrates the amplified output E and outputs a signal (hereinafter referred to as“ integrated output D ”). , 48 have the same configuration as that of the above-mentioned zero-crossing circuit 43, and receive a pulse signal (hereinafter, referred to as “pulse output B”) to which the integral output D is inputted.
A pulse output B and a pulse output C are input to the zero-cross circuit 45, and the exclusive OR (Excl
The Ex-OR circuit 46 outputs a signal (hereinafter, referred to as “pulse output A”) from the drive circuit 21 as in the first embodiment.
, A logic circuit (not shown) for detecting the end of the operator's position movement operation, and a pulse output A, a diode light emission signal Ra and a synchronization signal As.
And a control circuit (not shown) for outputting the image signal 47. Reference numeral 47 denotes a focusing control unit according to the present embodiment.

Next, the operation of this embodiment will be described with reference to the timing chart shown in FIG. With the above configuration, as in the first embodiment, the operator can operate and adjust the position of the mirror body 39 by turning on the switch 8 while holding the handle 7 to change the observation field of view. O
If FF is performed, the position of the mirror 39 is fixed. At this time,
The logic circuit in the light emitting circuit 46 detects the end of the position movement operation of the mirror 39 from the change in the potential of the electromagnetic brake operation signal Br, and accordingly, the control circuit in the light emitting circuit 46 outputs the pulse of the Ex-OR circuit 45. The output A is used as a synchronizing signal for the focusing control to output a diode light emission signal Ra and a synchronizing signal As to start the focusing control, and the same as in the first embodiment,
The focusing operation signal Vc is output from the distance measurement operation circuit 27 to drive the focusing motor 5a, whereby the observation optical system always has an accurate focusing state irrespective of the occurrence of the vibration of the mirror 39 and its state. Automatically transitioned to.

That is, when the brake operation is completed, the mirror 39 is fixed in position by the electromagnetic brake. However, depending on the length and structure of each arm such as the elevation operation arm 4, the mirror 39 vibrates after the brake operation is completed. The case is conceivable. In this case, this vibration is detected by an acceleration sensor 41 built in the mirror body 39, and the detected acceleration signal is amplified by the amplifier circuit 42, and shows a potential change as shown as an amplified output E in FIG. Then, the amplified output E and the integrated output D obtained by integrating the amplified output E (that is, the velocity displacement amount) are converted into the pulse output C and the pulse output B by the zero cross circuit 43 and the zero cross circuit 48, respectively. The pulse output C is a response output when the acceleration value reaches a zero point, that is, both ends (stop positions) of the amplitude and a center position of the amplitude,
The pulse output B is a response output when the speed value of the vibration reaches the zero point, that is, the position at both ends of the amplitude. Therefore, Ex-OR
In the circuit 45, if the exclusive OR of the pulse outputs C and B is calculated, the pulse output A output from the Ex-OR circuit 45 becomes a response output only when it reaches the center position of the amplitude (FIG. 9), thereby detecting the amplitude center position. Therefore, if the focus control is performed in synchronization with the pulse output A, the focus can be always detected at a fixed point where the vibration should converge even during the vibration, regardless of the occurrence of the vibration of the mirror body 39 and the state thereof. An accurate focus state can be obtained.

In general, the operating microscope is configured so that the gantry 1 and the operation part are spaced apart from each other due to hygiene considerations and space restrictions, and the mirror body is securely fixed. An electromagnetic brake is installed in a rotating part of the microscope such as a shaft part of an arm and a mirror body in order to improve operability at the time of moving operation. Therefore, it is conceivable that vibrations occur in the lens body after the operation of moving the position of the lens body from these configurations, and even if observation is performed at a low magnification, if vibration occurs during the operation, the effect may not be ignored. . In the present embodiment, even in such a vibration generation state, the focus detection is performed at the center position of the vibration amplitude, so that the focus detection can be performed more accurately on the observed part as compared with the conventional device. it can. Further, the surgeon does not need to wait for the convergence of the vibration after adjusting the position of the operation portion, and also does not need to perform a troublesome operation for stopping the vibration. Therefore, the operator can concentrate on the operation, and the operation can be performed more safely and smoothly.

Next, a third embodiment will be described with reference to FIGS. The same members as those in the above embodiments are denoted by the same reference numerals, and description thereof will be omitted. FIG. 10 is a circuit block diagram of the power supply unit 50 of the third embodiment. In the present embodiment, the acceleration detection direction of the acceleration sensor 41, that is, FIG. An acceleration sensor 61 for detecting the longitudinal acceleration of the mirror body 39 and an acceleration sensor 51 for detecting the vertical acceleration of the mirror body 39 are provided for the left and right directions of the mirror body 39 shown in FIG. The three-directional vibration state of the mirror body 39 supported movably spatially by the acceleration sensor is detected. Further, an encoder 58 is provided on a rotating shaft of a focusing motor 5a for performing focusing driving of the mirror body 39, and an encoder 5 is provided on a rotating shaft of a focusing motor 5b for performing scaling driving.
Reference numeral 9 is attached to detect the amount of rotation of each rotating shaft. In the drawing, 52a and 52b are connected to acceleration sensors 51 and 61, respectively, and are amplification circuits for amplifying the acceleration detection signal output from the acceleration sensor. 53a, 53b and 53c are two times for the input signal. This is an integration circuit that performs integration processing and outputs a signal.

Numeral 54 denotes a correction circuit, and an integration circuit 53
a peak detection circuit (not shown) for detecting the amplitude value of the displacement amount of the output signal a, and the displacement amount of the output signal of the integration circuit 53a at the output timing of the pulse output A from the Ex-OR circuit 45 Displacement amount circuit (not shown)
The detection signal of each circuit is output as a correction signal to a distance calculation circuit 56 described later.

Reference numeral 55 denotes a displacement detection circuit to which the detection signals of the acceleration sensors 41, 61, 51 are inputted via amplification circuits 42, 52b, 52a and integration circuits 53c, 53b, 53a, respectively. A displacement calculating circuit (not shown) for calculating the amount of displacement of each of the output signals 53b and 53c per unit time, a comparator circuit (not shown) for performing a comparison operation with each reference set value, An OR circuit (not shown) that outputs the logical sum of the output signals of the respective comparator circuits, and outputs the output of the OR circuit as a mirror position operation detection signal F to a light emitting circuit 63 described later. It has become.

Reference numeral 57 denotes a focusing drive detection circuit which is connected to the encoder 58 and counts a pulse signal from the encoder 58 by a built-in counter circuit to calculate a focusing operation amount. The value of the focusing operation amount of the focusing drive detection circuit 57 is determined by a focusing operation signal V
The output is reset to the initial state (zero) with the output of c. Reference numeral 62 denotes a zoom magnification calculating circuit (not shown) which is connected to the encoder 59 and has a counter circuit for counting pulse signals from the encoder 59 to detect a zoom magnification, and the objective lens 2.
Magnification input means (not shown) for inputting a magnification of 4
And a total magnification detection circuit (not shown) for calculating the total magnification power of the variable power optical system from these magnification values.

Reference numeral 63 denotes a logic circuit (not shown) for detecting the end of the position movement operation of the lens body 39 and a pulse output A, to which the lens body position operation detection signal F is inputted from the displacement detection circuit 55. And a control circuit (not shown) that outputs a diode light emission signal Ra and a synchronization signal As. Reference numeral 56 denotes a distance calculation circuit which detects the detection signals Va,
A distance measuring circuit (not shown) that calculates Vb, calculates the amount of focus shift and direction based on the calculation result, the total magnification signal from the magnification calculation circuit 62, and the correction signal of the correction circuit 54, and focus drive detection A comparator circuit (not shown) for comparing and calculating the focusing operation amount output signal from the circuit 57 and the defocus amount calculated by the distance measuring circuit, and focuses on the focusing driving circuit 22 according to the output value of the distance measuring circuit. A focusing operation circuit (not shown) for outputting the quasi-operation signal Vc. Reference numeral 60 denotes a focusing control unit according to the present embodiment.

Next, the operation of the present embodiment will be described with reference to the timing chart shown in FIG. With the above configuration, the operator turns on the switch 8 while holding the handle 7 to change the observation field of view, thereby controlling the position of the mirror 39.
When the adjustment is performed, the acceleration signals detected from the acceleration sensors 41, 61, and 51 are amplified by the amplifier circuits 41, 52b, and 52, respectively.
a, after being amplified in the integration circuits 53c, 53b, 5
The integral is double-integrated in 3a, and becomes the displacement amount of the mirror body 39 in each of the left, right, front, rear, up and down directions with the passage of time. Accordingly, the output value of the comparator when the displacement amounts in these three directions are compared with the respective reference set values in the comparator circuit in the displacement detection circuit 55 is a reference value for determining whether to execute or end the position moving operation with respect to the mirror 39. Becomes In the displacement detecting circuit 55, when the displacement amount per unit time exceeds the reference set value, it is determined that the position operation of the mirror 39 is to be performed. The setting is made in consideration of the structural conditions such as the length of each arm such as the arm 4 and the vibration amplitude conditions.

With the detection of the mirror position operation end signal F in the displacement detecting circuit 55, the control circuit in the light emitting circuit 63 uses the pulse output A as a synchronizing signal for focusing control and the diode light emitting signal Ra and the synchronizing signal. The focusing control is started by outputting the signal As (see FIG. 11), and the light receiving circuit 26 amplifies the detection signals Va and Vb from the two-divided PD 29 and outputs the amplified signals to the distance measurement calculation circuit 56. On the other hand, the correction circuit 54 calculates the vertical displacement in synchronization with the pulse output A based on the vertical displacement detected by the acceleration sensor 51. This is to correct the focusing operation signal Vc when the vertical oscillation cycle shifts at the distance measurement timing of the focusing control, and the mirror 39 is adjusted at the output timing of the diode light emission signal Ra. The displacement amount in the optical axis direction is obtained, the difference from the amplitude center is calculated as a correction value, and this value is output to the distance measurement calculation circuit 56.

Further, in response to the output of the diode light emission signal Ra from the light emitting circuit 63, the distance measuring operation circuit 56 inputs the total magnification signal from the magnification calculation circuit 62 as the total magnification information and the light receiving circuit 26. Input the detection signals Va and Vb from (Va−Vb) / (Va + Vb)
Is calculated to calculate the focus position information, and the amount of focus shift and its direction are obtained from the total magnification signal, the focus position information, and the correction value of the correction circuit 54. Then, a focusing operation signal Vc is output to the focusing drive circuit 22 in accordance with the amount of the focus shift and the direction thereof, and the focusing drive circuit 22 drives the focusing motor 5a to perform the focusing operation. . At this time, the output value of the encoder 58 has been reset in synchronization with the output of the focusing operation signal Vc.
The amount of rotation of the focusing drive motor 5a driven in accordance with the focusing operation signal Vc is converted into a focusing operation amount in a focusing drive circuit 57 via the encoder 58, and this value is compared with a comparator in the distance measurement operation circuit 56. Input to the circuit. The comparator circuit performs a comparison operation with the focus shift amount, and stops outputting the focusing operation signal Vc when the focus shift amount and the focusing operation amount become equal.

As described above, according to this embodiment, the execution or end of the movement of the mirror position can be detected by the acceleration sensor provided in the mirror portion. It does not require a signal to notify the movement state of the mirror unit from the drive unit, can flexibly respond to the combination of arms and drive systems of various structures, and enables reliable focusing control automatically. . Therefore, the operator does not need to adjust the focus, and can observe the operation portion in a clear focus state, so that the operator can concentrate on the operation.

[0030]

According to the present invention, the operation of changing the observation region by the operator is regarded as a movement of the position of the mirror body, and this is detected as a change in the position of the mirror body. Can be detected based on the detection signal.
Since the focusing control most required by the operator is performed, the focusing control can be performed reliably and accurately without deteriorating the operability of the operating microscope. Therefore, even if the operator changes the observation region during the operation, not only does the focusing operation become unnecessary, but also the operator does not need to pay attention to focusing, so that the operator can concentrate on the operation more safely. It is also effective for performing a smooth operation.

[Brief description of the drawings]

FIG. 1 is an external view of a surgical microscope having a focusing device of the present invention.

FIG. 2 is an arrow view of a pair of left and right stereoscopic observation optical systems of a surgical microscope having a focusing device of the present invention, as viewed from a plane including left and right optical axes.

FIG. 3 is a diagram showing an optical system in a plane including a photometric optical axis O in FIG. 2 and perpendicular to the paper surface.

FIG. 4 is a circuit block diagram of a power supply unit according to the first embodiment of the present invention.

FIG. 5 is a circuit block diagram of a focusing control unit according to the first embodiment.

FIG. 6 is a diagram showing a focus detection timing in the first embodiment.

FIG. 7 is a diagram illustrating an acceleration detection direction of an acceleration sensor built in a mirror body according to a second embodiment of the present invention.

FIG. 8 is a circuit block diagram of a power supply unit according to a second embodiment.

FIG. 9 is a diagram illustrating timings of an acceleration sensor and focus detection in a second embodiment.

FIG. 10 is a circuit block diagram of a power supply unit according to a third embodiment of the present invention.

FIG. 11 is a diagram showing the timing of focus detection in a third embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Stand 4 ... Elevation operation arm 5, 39
・ ・ ・ Mirror 6 ・ ・ ・ Barrel 7 ・ ・ ・ Handle 8 ・ ・ ・
Switch 9: Foot switch 11: Objective lens 12: Variable optical system 14: Eyepiece 20, 40, 50: Power supply 21: Drive circuit 22: Focusing drive Circuit 23: Variable magnification drive circuit 24: OR circuit 25, 46, 63,.
Light-emitting circuit 26 Light-receiving circuit 27, 56 Distance-measuring operation circuit 28 Infrared light-emitting diode 29 Two-part PD 30, 47, 60 Focusing controller 41, 51, 6
1 ... Acceleration sensors 42, 52a, 52b ... Amplification circuits 43, 48 ...
-Zero cross detection circuit 44, 53a, 53b, 53c-Integration circuit 45-Ex-OR circuit 54-Correction circuit 55-Displacement detection circuit 57-Focusing drive detection circuit 58, 59- ..Encoder 62 ... Magnification calculation circuit

Claims (1)

(57) [Claims] 1. A microscope comprising focus detecting means and focusing means.
A mirror body, and at least one of the position or angle of the microscope body
An operation for changing the position or angle of the microscope body in a surgical microscope focusing apparatus having a mirror body supporting means arbitrarily changeable.
A mirror body moving operation detection known means for knowledge, by the operation end signal from the mirror body movement operation detection known means,
A surgical microscope focusing device , comprising: a focusing control unit for automatically operating the focus detecting unit and the focusing unit .