JPH0545132A - Endoscope device for measurement - Google Patents

Abstract

(57) [Abstract] [Purpose] It is an object of the present invention to provide a measuring endoscope device capable of varying a scanning range of a measuring light and measuring a distance and the like by scanning a light spot suitable for a use state. .. A projection lens 27 for projecting measurement light for measuring a distance, a semiconductor laser 23 for supplying the measurement light to the projection lens 27, and scanning with the measurement light supplied to the projection lens 27. Scanning drive means using the piezoelectric elements 28a and 28b, a scanning range control circuit 42 for outputting a signal corresponding to the measurement light scanning range to the scanning drive means, and an instruction signal for instructing the scanning range control circuit 42 to the scanning range 41 for outputting the output through the designated range combination display circuit 39
Therefore, the measurement light scanning range can be variably set.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring endoscope apparatus provided with a control means for a scanning range of measuring light on the measuring endoscope side.

[0002]

2. Description of the Related Art An endoscope is widely used in the medical field for observing a deep part in a body cavity by inserting it into a body cavity or the like, and performing a medical treatment by using a treatment tool if necessary. It came to be used. or,
In the industrial field, endoscopes are widely used for inspecting the inside of jet engines or the inside of plants. In the case of this observation with an endoscope, it is necessary to measure the size of an object to be inspected such as a tumor or the height of a convex portion of the tumor when making a diagnosis.

Therefore, for example, Japanese Patent Application No. 1-342229
In this issue, the applicant proposed a measuring light projecting optical system for projecting measuring light for measurement and an apparatus capable of stereoscopic observation with normal illumination light.

[0004]

This device is one in which the measuring light is scanned within a certain range. Therefore, depending on the state of use, unnecessary portions may be scanned, and it may take a long time to measure, or conversely, the desired portion cannot be scanned and information of the desired portion cannot be obtained. As a result, it was not possible to perform a scan suitable for the usage condition. In addition, there are some cases where the measurement light has a fixed pattern, but this case also has the same drawback.

The present invention has been made in view of the above points, and an object thereof is to provide a measuring endoscope apparatus capable of varying the scanning range of the measuring light and performing the measurement by the scanning suitable for the use condition. And

[0006]

According to the present invention, there is provided a measuring light projection optical system for projecting measuring light for measuring a distance or the like,
Measuring light supply means for supplying measuring light to the measuring light projection optical system, scan driving means for scanning the measuring light supplied to the measuring light projection optical system, and control for changing the measuring light scanning range by the scanning driving means. By providing the means, the measuring light scanning range by the control means can be changed to a range suitable for the use environment and the like according to the use environment and the like.

[0007]

Embodiments of the present invention will be specifically described below with reference to the drawings. 1 to 5 relate to a first embodiment of the present invention, FIG. 1 shows the overall configuration of the endoscope apparatus for three-dimensional measurement of the first embodiment, and FIG. 2 shows an example of display on a monitor screen. FIG. 3 shows an example of a light spot appearing on the CCD image pickup surface when scanning the measurement light, FIG. 4 shows the tip end surface of the electronic scope, and FIG. 5 shows the principle for calculating the distance and the like.

As shown in FIG. 1, a three-dimensional measuring endoscope apparatus 1 according to the first embodiment has a three-dimensional measuring electronic endoscope (hereinafter referred to as an electronic scope) 2 having a built-in image pickup means. Light source means 3 for supplying normal illumination light and measurement light to the scope 2.
And a light source / processing device 5 including a signal processing means 4 for performing signal processing and calculation processing of three-dimensional information such as distance calculation.
And a monitor 6 as image display means for displaying a standard video signal generated by signal processing by the signal processing means 4.

The electronic scope 2 has an elongated and flexible insertion portion 7 so that it can be inserted into a body cavity, a wide-width operation portion 8 connected to the rear end of the insertion portion 7, and this operation. A universal cable 9 extending from a side portion of the portion 8 and a general connector 11 attached to an end portion of the universal cable 9 can be detachably connected to the light source / processing device 5.

The insertion portion 7 is a hard tip portion 1 from the tip side.
2, a bendable bending portion, and a flexible flexible tube portion, and the bending portion can be bent by operating the bending knob 15 provided on the side surface of the operation portion 8.

A light guide 16 for transmitting normal illumination light and an image guide 17 as a measuring light transmitting means for transmitting measuring light are inserted into the insertion portion 7, and the light guide 16 and the image guide 17 are universal cables. 9 is also inserted, and the (light guide) connector portion and the (image guide) connector portion at each end are integrally fixed to the general connector 11.

The light source / processing device 5 is provided with a (light guide) connector receiver 18 and a (image guide) connector receiver 19 to which the connector of the light guide 16 and the connector of the image guide 17 can be detachably connected. A lamp 21 and a condenser lens 22 are arranged inside the light guide connector receiver 18 so that the white illumination light of the lamp 21 can be condensed by the lens 22 and supplied to the connector of the light guide 16.

Further, (image guide) connector receiver 1
Inside of 9, semiconductor laser 23 and condenser lens 24
The condenser lens 24 condenses the condensable laser light from the semiconductor laser 23, that is, the measurement light, and irradiates the fiber bundle forming the connector of the image guide 17 as the measurement light.

Illumination light supplied to the connector of the light guide 16 is transmitted by the light guide 16 and is further illuminated from the end face on the emission side fixed to the tip portion 12 by the illumination lens 2.
The light is emitted to the subject 26 side through 5 and illuminates the subject 26 side in a wide area. The illumination lens 25 is attached at a distance different from the focus distance of the illumination lens 25 from the end surface on the exit side of the light guide 16 so that the array of fibers on the end surface on the exit side of the light guide 16 is not projected on the object 26 surface. ing.

The measuring light emitted to the connector of the image guide 17 is transmitted by the fiber irradiated with the measuring light in the image guide 17, and is further projected (projected) from the end face fixed to the tip portion 12. Then, the light is emitted to the subject 26 side to form a minute light spot on the subject 26 surface. This projection lens 27 is an image guide b
The image guide 17 is attached to the image guide 17 at a distance corresponding to the focus distance of the projection lens 27 from the end surface on the exit side of the image guide 17.
It is possible to form a minute light spot on the surface of the subject 26 without the measurement light emitted from the fiber on the end face on the emission side of B spread.

The semiconductor laser 23 and the condenser lens 24 are attached to, for example, a table 29 that is vibratingly driven by piezoelectric elements 28a and 28b.
By applying a drive signal from the measurement light scanning control means 30 to 28b, the piezoelectric element 28a moves vertically in FIG. 1 as shown by an arrow A, and the piezoelectric element 28b moves vertically in the direction B of FIG. Vibrate. The semiconductor laser 23 is similarly vibrated by the vibration in the vertical direction and / or the vertical direction, and the measurement light can be scanned in the arbitrary direction such as a straight line through the projection lens 27 to the subject 26 side, and the two-dimensional scanning can be performed. You can also do it. For example, the piezoelectric element 28
After linearly vibrating at a, the piezoelectric element 28b shifts a small amount in the direction perpendicular to this straight line, and the scanning that linearly vibrates again at the piezoelectric element 28a is repeated,
The measuring light can be scanned two-dimensionally.

The piezoelectric elements 28a, 28b can be driven by a staircase drive signal from the measuring light scanning control means 30. By this drive, the image guide 1 is driven.
The measuring light emitted to the end face of the fiber bundle of the connector 7 is sequentially emitted to each of the fibers at a constant interval in the scanning direction. In this case, the maximum scanning range Sm is substantially the range of the diameter of the fiber bundle forming the image guide 17 as shown in FIG.

A subject 2 illuminated with the illumination light over a wide area
6 is an objective lens 3 attached to the observation window of the tip portion 12
1 forms an image on the image pickup surface of the CCD 32 as an image pickup element arranged on the focal plane thereof. In front of this imaging surface, for example, a mosaic color filter 33 is attached,
Color separation is performed optically. This CCD 32 is a signal cable 3
The image forming circuit 3 is connected to the signal connector 35 of the connector 11 via the signal connector 4 and performs signal processing for image formation via the signal connector receiver 36 to which the signal connector 35 is connected.
7 and a distance calculation circuit 38 for performing distance calculation and the like.

The output signal of the image forming circuit 37 is displayed on the screen of the monitor 6 via the designated range synthesizing display circuit 39. The image forming circuit 37 performs signal processing for generating a standard video signal from the output signal of the CCD 32, and
The periphery of the image of the subject 26 is masked with endoscope display frame data generated in a ROM (not shown) or the like, and the image is output to the monitor 6 side. The distance calculation circuit 38 calculates the distance between the CCD 32 and the spot position of the measurement light formed on the surface of the subject 26 from the output signal of the CCD 32.

That is, the spot position detection process for obtaining the position (x, y) of the spot on the surface of the CCD 32 is performed, and the position data obtained by this detection process and the information for calculating the distance, that is, the focus of the projection lens 27. The distance f1 and the focal length f2 of the objective lens 32, the distance d between these optical axes, and the position a (relative to the optical axis of the projection lens 27) of the laser light incident on the incident end face of the image guide 17 (this position a
Is supplied from the measuring light scanning control means 30. )
The calculation using the principle of triangulation is performed using such information to calculate the distance R to the spot position (X, Y, Z) on the surface of the subject 26. The calculated data signal is superposed by a superimposing circuit (not shown) of the image forming circuit 37 and output to the monitor 6 side.

The output signal of the mouse 41 for designating the scanning range is also input to the designated range synthesis display circuit 39,
The designated range combination display circuit 39 generates a cursor display signal, superimposes the cursor display signal on the video signal corresponding to the endoscopic image from the image forming circuit 37, and outputs the video signal to the monitor 6. Therefore, the cursor display signal is displayed as a cursor K moving on the monitor screen according to the operation of the mouse 41 as shown in FIG.

By operating the mouse 41, the cursor K for designating the scanning range is moved on the monitor screen, and by operating the click button, one end of the scanning range is designated and the cursor is further moved. By moving K and operating the click button again, the other end can be designated. These two designations determine the scanning range when, for example, a linear scanning range is selected. In FIG. 2, K1 and K2 indicate an example of the scanning range designated by the operation of the mouse 41. When each designation signal is generated by the operation of the click button, the designated range combination display circuit 39 outputs the position information of each cursor on the designated monitor screen to the scanning range control circuit 42.

Distance information from the distance calculation circuit 38 is also input to the scanning range control circuit 42, and the scanning range control circuit 4
2 outputs to the measuring light scanning control means 30 a control information signal indicating to which direction and how much the semiconductor laser 23 should be moved (scanned) using these information to coincide with the scanning range designated on the monitor screen. ..

The measuring light scanning control means 30 outputs a driving signal to the piezoelectric elements 28a and 28b in response to the input control information signal, and corresponds to the scanning range on the monitor screen designated by the mouse 41. The light spot projected on the surface of the subject 26 is scanned by the scanning range. In this embodiment, the objective lens 31 and the projection lens 2
7 is provided adjacent to the tip 12 as shown in FIG.
An illumination lens 25 is provided on one side or on both sides as indicated by a dotted line.

In this embodiment, when the table 29 is vibrated in the vertical direction as shown in FIG. 1, the laser beam scans the fiber bundle in the vertical direction A on the incident end face side of the image guide 17, and by this scanning, On the emission end face side, the measurement light projected to the subject 26 side through the projection lens 27 corresponds to the state of scanning in the horizontal direction in FIG. 1 and the optical axis of the objective lens 31 and the projection lens 2 as shown in FIG.
In the plane m including the optical axis of 7, the projection lens 27
The light is emitted radially from the.

Further, the table 29 is vibrated in stages, and the pitch at that stage can be selectively set by, for example, a selection operation of the mouse 41. When this pitch is reduced, the number of spots per unit length in the scanning direction increases, the number of measurement points increases, and detailed measurement can be performed. On the other hand, if this pitch is set to a large value, the measurement result of the entire scanning range can be obtained in a short time. When the measurement is performed, this pitch can be selectively set.

For example, the surface of the subject 26 is a flat surface, and the piezoelectric element 2 is in a state where the end face of the tip portion 12 faces perpendicularly to this surface.
When the laser beam is scanned by oscillating 8a stepwise, spot rows s at almost constant intervals appear on the imaging surface of the CCD 32 in correspondence with the stepwise scanning as shown in FIG. 3B. Like When the pitch is fixed, the distance between the spot rows s changes depending on the distance between the tip portion 12 and the subject 26, and each spot is actually formed according to the principle of triangulation (on the surface of the subject 26). It is described that the distance to each position can be calculated (only the piezoelectric element 28a is vibrated stepwise, but each time only the piezoelectric element 28a is linearly moved stepwise, the piezoelectric element 28b also has a small amount. The laser beam scans the incident end face of the image guide 17 in a grid pattern, and the grid spots are formed on the surface of the subject 26).

On the other hand, when the surface of the subject 26 is a concave-convex surface, spot lines that are not at regular intervals appear linearly according to the concave-convex surface (the optical axis of the objective lens 31 and the light of the projection lens 27). (When scanned in the plane m including the axis). Also in this case, the distance to the spot position actually formed on the surface of the subject 26 can be calculated from the position information of each spot on the CCD 32 by using the principle of triangulation, and the distance calculation circuit 38 described above can be calculated. Calculates this distance. When scanning is performed in a direction other than the surface m, spot positions are scattered around a straight line depending on the uneven surface.

FIG. 5 shows spot positions (X, Y, Z) in the case of scanning in this plane m (however, in this figure, Y
FIG. 3 is an explanatory diagram of a principle of obtaining (when = 0).

In FIG. 5, it is assumed that the horizontal (horizontal) direction is the X axis, the optical axis direction of the objective lens 31 is the Z axis, and the direction perpendicular to the paper is the Y axis. A projection lens 27 for the laser light incident on the incident end surface of the image guide 17.
The laser light incident from the optical axis of at a distance a forms a spot at a position (X, Y, Z) on the surface of the subject 26 (with the position of the objective lens 31 as the origin). This spot is formed by the objective lens 31 at the position (x,
y) (however, in this figure, when y = 0), an image is formed, and this position (x,
y) Information is detected.

Using the focal length f1 of the projection lens 27 and the distance d between the optical axes of the projection lens 27 and the objective lens 31, a: f1 = d-X: Z (1) holds. Further, focusing on the image forming system of the objective lens 31, x: f2 = X: Z (2) holds. From equations 1 and 2, X = f1 · d · x / (f2 · a + f1 · x) (3), and Z = f2 · X / x = f1 · f2 · d / (f2 · a + f1 · x) (4) Becomes Further, the distance R from the objective lens 31 to the spot position is obtained as the square root of RR = (X * X + Z * Z) (5). The same can be obtained when Y = 0 is not satisfied.

It should be noted that one or more measurements can be performed in one field or one frame period using the measurement light, and since a spot is not formed due to a cavity or the like (or the return light of the spot cannot be detected), distance calculation is performed. If the distance cannot be calculated, or the distance cannot be calculated even if a spot is formed on the surface of the subject 26 because it is out of the imaging range (or field of view range), the level of the return light of the projected spot is different from the surrounding environment. In some cases, such as when there is no significant difference from the level, the distance calculation circuit 38 cannot detect the spot position, and therefore outputs a signal indicating that measurement is impossible to the image forming circuit 37, and the monitor screen is displayed. I am trying to display that fact.

In this display, for example, the spot position is detected,
It is performed when it cannot be performed by the time set by a timer (not shown). Further, in the case where a large number of spots are formed in one field or one frame period, if the number of spots to be detected is different from the number of spots that should have been projected, a mismatch or the like is displayed.

Further, the distance calculation circuit 38 calculates the distance R and, at the same time, a substantially distance direction component connecting the subject 26 and the objective lens 31 of the tip portion 12, that is, the amount of unevenness in the height direction of the surface of the subject 26 (see FIG. 5 component in the Z direction), and outputs the unevenness data signal to the image forming circuit 37. The image forming circuit 37 superimposes the unevenness data signal on the video signal representing the endoscopic image to specify the specified range. The data is output to the monitor 6 via the synthesizing display circuit 39 and, for example, as shown in FIG. 2, the calculated concavo-convex data is displayed in the lower portion of the endoscopic image display area 6a in the scanning range (for example, K1 And the range connecting K2).

According to this embodiment, since the scanning range can be variably set, the scanning range suitable for the situation can be set according to the use situation, and accordingly (the unnecessary range in the conventional example is scanned. It is possible to solve the problem that extra time is required for distance measurement (due to the above), and detailed distance measurement data and the like can be obtained by scanning the part of interest in detail. Further, according to this embodiment, in addition to the normal endoscopic observation, the amount of unevenness of the affected area or the like can be easily displayed, and effective data can be obtained when making a diagnosis. Therefore, it becomes easy to make an accurate diagnosis. In the above description, the scanning range is designated in the endoscopic image, but the scanning range may be designated in a state where the scanning distance is constant.

FIG. 6 shows an endoscope apparatus 5 according to the second embodiment of the present invention.
1 is shown. In this embodiment, the measurement time can be shortened by limiting the scanning range and the setting of the scanning range can be simplified. In this embodiment, in the first embodiment shown in FIG. 1, instead of the mouse 41 capable of arbitrarily designating the scanning range, for example, a limited scanning selection switch 52 is provided on the operation unit 8 of the electronic scope 2 and further the designated range composite display is provided. Instead of the circuit 39, a limited scanning range composite display circuit 53 is provided. The limited scan selection switch 52 is connected to the limited scan range composite display circuit 53 via a signal line 54 (by connecting the general connector 11).

The limited scanning range synthesizing display circuit 53 has previously registered information corresponding to a plurality of scanning ranges in, for example, a ROM, and the limited scanning selection switch 52 is operated to select an arbitrary scanning range from a plurality of scanning ranges. Can be selected. For example, the limited scan selection switch 52 is composed of two ON / OFF switches. One switch is used to make a selection decision, and the other switch is used to display the next scan range on the monitor 6. Then, a desired scanning range can be displayed on the monitor 6 by operating the other switch, and at this time, the scanning range can be selectively determined by operating one switch.

The other structure is the same as that of the first embodiment.
According to this embodiment, the scanning range can be selected by a simple operation, and the measurement result can be obtained in a short time. In addition, RO
As the scanning range registered in M or the like, a scanning range that is often used statistically may be registered or may be registered.

FIG. 7 shows an endoscope apparatus 6 according to the third embodiment of the present invention.
1 is shown. In this embodiment, the scanning range for scanning in a line is made variable. In this embodiment, an up / down instruction means 62 is provided in place of the mouse 41 capable of arbitrarily specifying the scanning range in the first embodiment shown in FIG.
A line scan synthesis display circuit 63 is provided instead of the designated range synthesis display circuit 39, and only one piezoelectric element 8b is provided.

In this embodiment, the laser light is only oscillatingly moved by only one of the piezoelectric elements 8b. Therefore, the scanning direction of the measuring light emitted to the subject 26 via the projection lens 27 is, for example, as shown in FIG. The direction is perpendicular to the plane m explained,
This direction is indicated by n in FIG. By operating the up / down instruction means 62, the scanning range in this direction can be changed. For example, the up-down instruction means 62 is formed of two switches as in the second embodiment, and the scanning range can be changed and selected by operating these switches.

In this embodiment, since the scanning is performed in the vertical direction in a line shape, the image guide 17 has a thin plate shape, and the projection lens 27 arranged so as to face the tip end surface of the image guide 17 is also a straight line. 8 is used (for example, an end surface of the tip portion 12 is shown in FIG. 8).
As shown in.

According to this embodiment, since the scanning direction is linear, it is possible to set a wide linear scanning range (without increasing the diameter of the insertion portion) as shown in FIG. On the contrary, when a wide scanning range is not required, the insertion portion 7 can be made thin.

FIG. 9 shows an endoscope apparatus 7 according to the fourth embodiment of the present invention.
1 is shown. In this embodiment, the scanning range can be set so that the measurement light is scanned in a circular shape, a zigzag shape, or the like. This embodiment is the same as the first embodiment shown in FIG.
Measuring light scanning instruction means 7 for sequentially instructing the scanning direction of the measuring light
2 is provided instead of the mouse 41, and the measuring light scanning instruction means 7 is provided.
The instruction signal from 2 is input to the measuring light coordinate converting means 73 provided in place of the scanning range control circuit 42, and data for converting the coordinate and for the next scanning direction and how much the laser beam should be moved in that direction are stored. Calculated and measuring light scanning control means 3
It is output to 0. The measuring light scanning control means 30 sends a drive signal to the piezoelectric elements 28a and 28b so that a spot is formed in the scanning range designated by the measuring light scanning instruction means 72 according to the data output from the measuring light coordinate converting means 73. Output.

It should be noted that the desired scanning may be performed by registering in advance data capable of performing scanning such as circular and zigzag and selecting from these. Further, in this embodiment, the output signal of the image forming circuit 37 is directly output to the monitor 6.

FIG. 10 shows an endoscope apparatus 81 according to the fifth embodiment of the present invention. In this embodiment, a pointing means for instructing to project a spot on a point of interest such as an affected area in an endoscopic image is provided. In this embodiment, a designated point composition display circuit 82 is provided in place of the designated range composition display circuit 39 in the first embodiment shown in FIG. 1, and a light spot is projected on the designated point by the mouse 41. To

The data of each designated point is designated point composition display circuit 8
2 is input to the scanning range control circuit 42, the distance and the direction between the designated adjacent designated points are calculated, and the data is output to the measurement light scanning control circuit 30. The measurement light scanning control circuit 30 outputs a scanning drive signal corresponding to the direction and distance connecting the points to the piezoelectric elements 28a and 28b so that a light spot is formed near each designated point. The distance calculation circuit 38 calculates the distance at each designated point, further calculates the unevenness amount, and displays it on the screen of the monitor 6, for example, as shown in FIG.
The components are projected in the vertical and horizontal directions. In addition, in FIG. 11, a cross indicates each designated point. Other display methods may be used. According to this embodiment, it is possible to surely obtain the unevenness amount of a desired portion. FIG. 12 shows an endoscope apparatus 91 according to the sixth embodiment of the present invention. In this embodiment, scanning is performed vertically and horizontally, and the scanning range can be variably set. This embodiment is different from the first embodiment shown in FIG. 1 in that a cross scan combination display circuit 92 is provided instead of the designated range combination display circuit 39.
By using the up / down / left / right instructing means 93 provided in place of the mouse 41, the up / down and left / right direction scanning ranges can be variably set. In this embodiment, most of the required functions can be realized in normal use and the scanning range can be set easily. Note that the present invention is not limited to the case of an electronic scope, and can be similarly applied to an optical endoscope such as a fiberscope equipped with a TV camera having a built-in image pickup means such as a CCD. Is clear.

Further, in each embodiment, a gradient index lens or a relay lens system can be used instead of the image guide used for transmitting the measurement light, and one end face like a light guide can be used. It is also possible to use a light guide provided with a correlating means for the case where the arrangement of the fibers on the other end face is not regular.

Further, in the above-mentioned embodiment, the laser light radiated to the incident end face side of the image transmitting means is scanned in order to scan the measuring light spot on the subject surface, but the invention is not limited to this. Instead, for example, the exit side end face portion of the image guide 17 is vibrated in the direction orthogonal to the optical axis of the projection lens 27, or the projection lens 27 is vibrated in the direction orthogonal to the optical axis, and the projection lens 27 is moved. The measurement light spot projected on the subject side may be scanned.

In each of the above embodiments, the measuring light is mechanically scanned by the light source device side, for example, by a piezoelectric element,
Although the incident position on the incident end face of the image transmission means is changed, an optical element such as KDP may be used instead of the piezoelectric element to control the optical characteristics of this element with respect to an electric signal so as to have an equivalent function. .. Instead of scanning mechanically, a plurality of LEDs or the like are arranged in a line shape or a grid shape at regular intervals so as to face the incident end surface of the image transmission means, and these are simultaneously or selected to be lit. It is also good (it may drive sequentially without driving simultaneously). Further, without providing the image transmitting means, a plurality of LEDs or the like may be arranged on the focal plane of the projection lens 27 at regular intervals in a line shape or a grid shape, and these may be simultaneously or selectively lighted.

When the measurement light spots are formed two-dimensionally, the distances between the measurement light spots can be calculated and the three-dimensional display of the uneven shape of the object surface can be performed. In this case, if necessary, it is possible to interpolate to obtain the uneven shape other than the measurement points. Further, in the above-mentioned embodiment, the illumination is performed by the white light, but the illumination may be performed by the field sequential light. Further, although the image forming circuit 37 and the distance calculating circuit 38 are housed in the same device in the above-described embodiment, they may be separately provided. This also applies to the light source device. The wavelength of the measurement light may be in the visible light range or may be outside the visible light range. Further, a combination of the above-mentioned respective embodiments partially or the like also belongs to the present invention.

[0051]

As described above, according to the present invention, the measurement light projection optical system for projecting the measurement light for distance measurement and the like, and the measurement light supply means for supplying the measurement light to the measurement light projection optical system. And a scanning drive means for scanning the measurement light supplied to the measurement light projection optical system, and a control means for changing the scanning range of the measurement light by the scan drive means. It can be changed so that it becomes a suitable scanning range for measuring light, and it is possible to prevent the calculation of distances for unnecessary parts and to prevent data of necessary parts from being obtained. It enables measurement suitable for the environment.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a three-dimensional measurement endoscope apparatus according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a display example of a monitor screen.

FIG. 3 shows CC when laser light is moved stepwise.
Explanatory drawing which shows the light spot observed by D.

FIG. 4 is a front view showing a front end surface of a measuring electronic scope.

FIG. 5 is an explanatory diagram of calculation of distance and the like in a distance calculation circuit.

FIG. 6 is a configuration diagram of a measurement endoscope apparatus according to a second embodiment of the present invention.

FIG. 7 is a configuration diagram of a measurement endoscope apparatus according to a third embodiment of the present invention.

FIG. 8 is a front view showing a tip surface of a measuring electronic scope according to a third embodiment.

FIG. 9 is a configuration diagram of a measuring endoscope apparatus according to a fourth embodiment of the present invention.

FIG. 10 is a configuration diagram of a measuring endoscope apparatus according to a fifth embodiment of the present invention.

FIG. 11 is an explanatory diagram showing a display example on a monitor screen in the fifth embodiment.

FIG. 12 is a configuration diagram of a measuring endoscope apparatus according to a sixth embodiment of the present invention.

[Explanation of Codes] 1 ... Endoscopic device for three-dimensional measurement 2 ... Electronic scope 3 ... Light source means 4 ... Signal processing means 5 ... Light source / processing device 6 ... Monitor 7 ... Insertion part 8 ... Operation part 11 ... General connector 16 ... Light guide 17 ... Image guide 21 ... Lamp 23 ... Semiconductor laser 27 ... Projection lens 28a, 28b ... Piezoelectric element 30 ... Measuring light scanning control means 31 ... Objective lens 32 ... CCD 37 ... Image forming circuit 38 ... Distance calculation circuit 39 ... Designated range synthesis display circuit 41 ... Mouse 42 ... Scan range control circuit

Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location G02B 23/26 A 7132-2K

Claims (1)

[Claims] 1. A measuring light projecting optical system for projecting measuring light for measuring a distance, measuring light supplying means for supplying measuring light to the measuring light projecting optical system, and at least the measuring light projecting optical system. An endoscope apparatus for measurement, comprising: a scanning driving unit that scans emitted measurement light; and a control unit that changes a scanning range of the measurement light by the scanning driving unit.