JP2837849B2 - Light source device for endoscope - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a light source device for an endoscope which can supply illumination light and white light in a sequential manner and can remove noise generated from a motor for driving a rotary filter or the like.

[Problems to be solved by conventional technology and invention] In recent years, by inserting an elongated insertion portion into a body cavity,
An endoscope (also referred to as a scope or a fiber scope) capable of observing organs in a body cavity or performing various treatments using a treatment tool inserted into a treatment tool channel as necessary.
Is widely used.

Also, various electronic scopes using a solid-state imaging device such as a charge-coupled device (CCD) as an imaging unit have been proposed. This electronic scope has advantages such as higher resolution than a fiber scope, easy recording and reproduction of images, and easy image processing such as enlargement of an image and comparison of two images.

For example, as described in Japanese Patent Application Laid-Open No. 61-82731, a surface for sequentially switching illumination light to R (red), G (green), B (blue), etc. A sequential type and, for example, as shown in JP-A-60-76888, a filter array in which color filters transmitting color lights such as R, G, and B are arranged in a mosaic pattern on the front surface of a solid-state imaging device. There is a color mosaic type (also referred to as a simultaneous type) provided. The frame sequential method has an advantage that the number of pixels can be reduced as compared with the color mosaic method, while the color mosaic method has an advantage that color shift does not occur.

Further, the electronic scope is diversified according to the purpose of use. For example, for upper or lower fire extinguishers,
An insert having an outer diameter of about 10 mm is used. On the other hand, for bronchial use, for example, an outer diameter of about 5 mm or less is usually required. As described above, using the same type of imaging device and the same type of imaging method for various electronic scopes having a wide range of outer diameters of the insertion portion is physically and performance impractical. That is, for example, in order to realize an electronic scope for bronchi (small diameter), an imaging element having a small number of pixels must be used.

When the number of pixels is small as described above, in order to prevent a decrease in resolution, rather than using a color mosaic filter using a color mosaic filter, light of each wavelength of R, G, and B is illuminated in a frame sequential manner. It is advantageous to use a frame sequential color imaging system in which frame sequential imaging is performed under the illumination, and these images are combined and displayed in color.

On the other hand, for those having an outer diameter of about 10 mm, increasing the number of pixels and adopting a color mosaic imaging method is advantageous for improving image quality.

Incidentally, the fiber scope or the electronic scope is generally used by being connected to a light source device that supplies illumination light suitable for each scope.

The illumination method differs between the fiber scope, the plane-sequential type electronic scope, and the color mosaic type electronic scope. That is, the fiber scope and the color mosaic type electronic scope require white light, and the plane-sequential type electronic scope requires light that sequentially switches to R, G, B, and the like. However, the conventional light source device can only output illumination light corresponding to one of a plane-sequential type electronic scope and a color mosaic type electronic scope or a fiber scope. However, it is necessary to prepare different light source devices and perform different operations, which is not economical and efficient.

In order to address the above problems, the present applicant has proposed a light source device for an endoscope which can supply illumination light corresponding to a plane-sequential electronic scope and a mosaic electronic scope or a fiber scope. This endoscope light source device is interposed on an optical path of white light so as to be compatible with a plane-sequential type electronic scope, and a rotary filter capable of transmitting plane-sequential light is rotationally driven by a motor or the like. A moving motor is provided so that the rotary filter can be retracted from the optical path of white light so as to be compatible with an electronic scope or a fiber scope.

However, various control circuits are provided in the light source device in addition to the drive motor, and the influence of noise generated when the motor is driven on the control circuit has not been considered.

[Object of the Invention] The present invention has been made in view of the above circumstances, and is intended for an endoscope in which noise generated from a motor during rotation and movement of a rotary filter does not enter other control circuits. It is an object to provide a light source device.

[Means for Solving the Problems] A light source device for an endoscope according to the present invention includes: a rotating filter that transmits illumination light from a light source to generate surface-sequential illumination light; a motor that rotates the rotation filter; A motor drive circuit for rotationally driving a motor, rotation detection means for detecting rotation of the rotation filter or the motor, and a signal for performing rotation control in the motor drive circuit based on an output from the rotation detection means. A control circuit to generate, the motor, a common power supply for supplying power to the motor drive circuit and the control circuit, comprising:
A noise filter is provided between at least one of the power supply and the motor, and at least one of the power supply and the motor drive circuit and the control circuit to prevent noise from the motor from entering the motor drive circuit and the control circuit. To prevent.

[Operation] In the present invention, the rotation filter transmits the illumination light from the light source and generates the field sequential illumination light. The motor rotates the rotary filter that is driven to rotate by the motor drive circuit. The rotation detecting means detects the rotation of the rotation filter or the motor, and a control circuit generates a signal for performing rotation control in the motor drive circuit based on an output from the rotation detecting means. Further, the motor, the motor drive circuit and the control circuit are supplied with power from a common power supply, and are provided in at least one of between the power supply and the motor, and between the power supply and the motor drive circuit and the control circuit. The noise filter prevents noise from the motor from entering the motor drive circuit and the control circuit.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

First, before describing an embodiment of the present invention, a light source device for an endoscope which is a premise of the present invention will be described. 1 and 2 relate to the light source device for an endoscope which is the premise of this, FIG. 1 is a block diagram showing the configuration of the light source device for an endoscope, and FIG. 2 is the overall configuration of the endoscope device. FIG.

In FIG. 2, an endoscope apparatus 1 is a fiberscope 2
And a light source device 3 for supplying illumination light to the fiber scope 2.

The fiber scope 2 includes an elongated insertion section 6, a large-diameter operation section 7 connected to the rear end of the insertion section 6, and a universal cable 8 extended from a side of the operation section 7. Have.

A rigid distal end portion 9 is provided at the distal end side of the insertion portion 6, and a bending portion that can be bent rearward adjacent to the distal end portion 9.
11 are provided. Further, behind the curved portion 11,
A flexible soft part 12 is provided continuously. The bending portion 11,
By operating a bending operation knob 13 provided on the operation unit 7, bending can be performed in the vertical and horizontal directions.

An eyepiece 17 is provided at the rear end of the operation unit 7,
The subject image can be observed with the naked eye.

A light source connector 14 is provided at the rear end of the universal cable 8 so that it can be connected to a connector receiver 16 provided in the light source device 3.

In FIG. 1, a light guide formed by a fiber bundle capable of transmitting illumination light is provided in the insertion portion 6.
The light guide 18 passes through the universal cable 8 and is connected to the light source device 3 by the light source connector 14.

Illumination light emitted from the light source lamp 19 is incident on the incident end face of the light guide 18. Between the light source lamp 19 and the incident end face of the light guide 18,
On the optical path of the illumination light, there is provided a rotary filter 22 which has a color transmission filter that can transmit each color light of red (R), green (B), and blue (B) and is driven to rotate by a motor 21.
The illumination light transmitted through the rotary filter 22 passes through a stop 23 whose light quantity can be adjusted and a shutter 24, is condensed by a condenser lens 26, and is incident on the incident end face of the light guide 18.

The motor 21 is provided with a rack 27, and a pinion 25 connected to a drive shaft of the motor 28 is engaged with the rack 27. The driving of the motor 28 is controlled by a motor moving circuit 29 so that the rotary filter 22 can be inserted into and removed from the optical path of the light source lamp 19.

The motor 21 is driven by a motor drive circuit 32 controlled by a motor control circuit 31. Also, this motor control circuit 31
The rotation speed is fed back more,
The motor is always driven at a constant rotation speed. Further, the motor control circuit 31 receives a signal representing the position of the color transmission filter from a photo sensor 33 capable of detecting the rotation of the rotation filter 23. The motor control circuit 31 receives a synchronization signal from a signal processing circuit (not shown), and inputs a signal synchronized with the synchronization signal to the motor drive circuit 32.

The iris 23 is configured such that an iris amount is adjusted by an iris control circuit 34 that outputs a control signal by inputting an iris information signal from a signal processing circuit (not shown), and illumination light emitted from the light source lamp 19. Can be optimized. The opening and closing of the shutter 24 is controlled by a shutter control circuit 36. The aperture control circuit 34 and the shutter control circuit 36 are controlled by an arithmetic circuit (hereinafter abbreviated as CPU) 37, and the motor moving circuit 29 is also controlled by the CPU 3
7 is controlled.

Power is supplied from a power supply circuit 38 to the motors 21 and 28, the motor moving circuit 29, the motor control circuit 31, and the motor drive circuit 32 which constitute a drive circuit system via a filter configured by a choke coil L1 and a capacitor C1. Aperture control circuit which is supplied and further constitutes a control circuit system
The choke coil L is connected to the shutter control circuit 34, the shutter control circuit 36, and the CPU 37.
Power is supplied from the power supply circuit 38 via a filter constituted by 2 and the capacitor C2.

The operation of the endoscope light source device 3 configured as described above will be described.

When the fiberscope 2 is connected to the light source device 3, detection means (not shown) outputs a signal to the CPU 37. The CPU 37 outputs a control signal to the motor moving circuit 29 to instruct the motor 21 to move. The motor moving circuit 29 controls the motor 28 by a control signal.
Is driven to retract the rotary filter 22 from the optical path. Illumination light emitted from the light source lamp 19 passes through the diaphragm 23 and the shutter 24 and is collected by the condenser lens 26, and the light guide
It is incident on the 18 incident end face. The subject image illuminated by the illumination light can be visually observed from the eyepiece 17.

The aperture control circuit 34 receives an aperture information signal from the CPU 37 instead of an external aperture information signal, and adjusts the amount of light.

When a still camera (not shown) is attached to the eyepiece 17, the shutter control circuit 36 operates the shutter 24 by a control signal of the CPU 37.

Power is supplied to the control circuit system from the power supply circuit 38 via a filter constituted by the choke coil L2 and the capacitor C2. In this case, noise generated by the motor 28 that moves the rotary filter 22 is prevented from flowing to the control circuit system by the choke coil L1.

When a plane-sequential type electronic scope (not shown) is connected to the light source device 3, a signal representing the plane-sequential type electronic scope is input to the CPU 37 by detection means (not shown), and the CPU 37 moves the rotary filter 22 to the motor moving circuit 29. , The motor 28 is driven, and the rotary filter 22 is inserted into the optical path of the light source lamp 19.

The motor control circuit 31 is driven by a synchronization signal input from a control device (not shown).
A signal is output to 32, and the motor drive circuit 32 drives the rotation filter 22 by the motor 21. Rotary filter 22
The illumination light transmitted through the light guide 18 is supplied to the incident end face of the light guide 18.

The aperture control circuit 34 receives an aperture information signal from a control device (not shown) and operates the aperture 23 so as to obtain an optimal light amount.

Power is supplied to the drive circuit system from the power supply circuit 38 via a filter composed of the choke coil L1 and the capacitor C1, and to the control circuit system, power is supplied via a filter formed by the choke coil L2 and the capacitor C2. Is supplied.

The noise generated by motors 21 and 28 is choke coil L1
And flows into the ground side from the capacitor C1, so that it does not enter the control circuit system. Even when noise is generated from the power supply circuit 38 side, the choke coils 1L1 and L2 prevent mixing.

The motor may be a cooling fan motor for cooling the light source lamp 19.

Hereinafter, embodiments of the present invention will be described based on the endoscope light source device 3 described above.

FIG. 3 is a block diagram illustrating a configuration of an endoscope light source device according to one embodiment of the present invention.

In this embodiment, power is supplied to each control circuit via the filter described in the light source device for an endoscope, which is a premise of the present invention. Note that the same components as those of the endoscope light source device on which this assumption is based are denoted by the same reference numerals, and description thereof will be omitted.

From the power supply circuit 38, the motor 21 passes through a filter formed by the choke coil L1 and the capacitor C1, the motor 28 passes through a filter formed by the choke coil L2 and the capacitor C2, and the motor moving circuit 29 passes through the choke coil. Through the filter formed by L3 and the capacitor C3, the motor control circuit 31
Through a filter formed by L4 and capacitor C4, motor drive circuit 32 is formed by a filter formed by choke coil L5 and capacitor G5, and aperture control circuit 34 is formed by choke coil L6 and capacitor C6. The shutter control circuit 36 is supplied with power via a filter formed by the choke coil L7 and the capacitor C7, and the CPU 37 is supplied with power via the filter formed by the choke coil L8 and the capacitor C8. ing.

In the present embodiment, since the supply of power to each control circuit is separated, not only the noise generated by the motors 21 and 28 can be prevented from being mixed into other control circuits, but also the noise between the control circuits can be reduced. Mixing can be prevented.

That is, it is possible to prevent noise generated by a motor or the like that drives the rotary filter from being mixed into other circuits, and to prevent malfunction or the like.

The motor described in the above embodiment is not limited to a rotary motor, but may be a solenoid, a linear motor, or the like.

[Effects of the Invention] As described above, according to the present invention, noise generated from a motor during rotation and movement of a rotary filter does not enter another control circuit, thereby preventing malfunction and failure of the control circuit. can do.

[Brief description of the drawings]

1 and 2 relate to a light source device for an endoscope which is a premise of the present invention, FIG. 1 is a block diagram showing a configuration of the light source device for an endoscope, and FIG. 2 is an entire endoscope device. FIG. 3 is a block diagram showing a configuration of an endoscope light source device according to a first embodiment of the present invention. 3 ... Light source device, 21 ... Motor 22 ... Rotary filter, 23 ... Aperture 24 ... Shutter, 28 ... Motor 29 ... Motor moving circuit 31 ... Motor control circuit 32 ... Motor drive circuit 34 ... Aperture control circuit 36 ... Shutter control circuit 37 ... Calculation circuit 38 ... Power supply circuit

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Takeaki Nakamura 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside O-Limpus Optical Industrial Co., Ltd. (72) Inventor Yuji Ikuno 2-43-2 Hatagaya, Shibuya-ku, Tokyo No. Within Olympus Optical Co., Ltd. (72) Inventor Toshiaki Nishikori 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd. (72) Hiromasa Suzuki 2-43-2, Hatagaya, Shibuya-ku, Tokyo No. Olympus Optical Co., Ltd. (56) References JP-A-60-76717 (JP, A) JP-A-60-112017 (JP, A) JP-A-55-130644 (JP, A) (58) Survey Field (Int.Cl. ⁶ , DB name) G02B 23/00

Claims (1)

(57) [Claims] 1. A rotary filter that transmits illumination light from a light source to generate surface-sequential illumination light, a motor that rotates the rotary filter, a motor drive circuit that rotationally drives the motor, and the rotary filter. Or a rotation detecting means for detecting rotation of the motor; a control circuit for generating a signal for performing rotation control in the motor driving circuit based on an output from the rotation detecting means; and the motor, the motor driving circuit and the control circuit. And a common power supply for supplying power to the motor, and a noise filter is provided in at least one of between the power supply and the motor, and between the power supply and the motor drive circuit and the control circuit, and noise from the motor is provided. Characterized in that light is prevented from entering the motor drive circuit and the control circuit. Apparatus.