JP3328689B2 - Dental CCD camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dental CCD camera which is inserted into an oral cavity and displays an observation image of the oral cavity on a TV monitor, and in particular, a side view lens is connected to a camera body having a built-in CCD element. It is related to the connecting portion.

[0002]

2. Description of the Related Art As a conventional CCD camera, as shown in FIG. 4, a side view lens 2a or a side view lens 2a having a prism 4 for guiding incident light and a fiber 5 is attached to a camera body 1 having a CCD element 6 built therein. A lens unit 2 such as a direct-view lens unit 2b as shown in FIG. 5 is selected and connected depending on the observation direction in the oral cavity, and the incident light of the observed image is
What is projected on a V monitor is common. In addition, there is another type in which the lens unit 2 is integrated with the camera body 1 and the lens unit 2 cannot be replaced.

[0003]

The above-mentioned conventional CCD camera is of a type in which the lens unit 2 is detachable from the camera body 1 as well as the one in which the lens unit 2 is integrated with the camera body 1. Also in this case, as shown in FIG. 6, a projection 10 is provided on the connection portion, and the projection 10 is hooked to the other side so that the connection portions cannot be rotated.

For this reason, when alternately observing both side surfaces of the upright image 7 with the side-view lens unit 2a as shown in FIG. 7, for example, when the side-view lens unit 2a is turned rightward, the TV monitor 9 is used. Assuming that the projected image is an erect image 7a, the TV when the side-viewing lens unit 2a is turned to the left and observed.
The image on the monitor 9 becomes an inverted image 7b, and the top and bottom are reversed. The left and right images are also reversed in the upper and lower images.

[0005] By the way, the teeth grow upward from the lower side or downward from the upper side. However, when the lens portion of the camera is taken sideways in the oral cavity and photographed, the teeth grow upward from the upper side due to the above phenomenon. Since the teeth are projected on the TV monitor as if they were growing sideways, there is a problem that it is difficult for a person who has no knowledge of the CCD camera to understand.

Therefore, the present invention has been made in view of the above-mentioned problems. When observing the inside of the oral cavity, even if the camera is rotated in order to facilitate communication with a patient, the TV monitor has a desired structure. An object of the present invention is to provide a CCD camera capable of projecting in a direction, stabilizing an image by fixing a rotated position, and confirming a rotated angle.

[0007]

In order to achieve the above object, a camera body 1 having a built-in CCD element and a lens unit 2 such as a side-view lens unit or a direct-view lens unit are connected to project an observation image on a TV monitor. The camera body 1 and the lens unit 2 are connected to each other by fitting and connecting the outer diameter of the connection unit 7 of the lens unit 2 to the inner diameter of the connection unit 7 of the camera body 1. In a dental CCD camera configured to be relatively rotatable, a plurality of tapered through-holes 10 each having a smaller diameter from the outer diameter side toward the inner diameter side are provided in the connecting portion 7 of the camera body 1 along the circumference. A steel ball 11 is inserted into each through-hole 10, and the outer peripheral surface of the connecting portion 7 of the lens unit 2 fitted into the inner diameter of the connecting portion 7 of the camera body 1 is inserted into each through-hole 10 of the camera body 1. Arc-shaped at the corresponding position Circumferential groove 12 engraved, and in a state in which the lens portion 2-fitted to the camera body 1, the circumferential groove 12 of the steel ball 11 which is put into the through hole 10 a lens section 2
At the same time, the steel balls 11 are pressed by the inner diameter portion 15b of the sleeve 14 pressed toward the lens portion 2 by the spring 13.
Is pressed into the circumferential groove 12, and the steel ball 11 is retracted against the elastic force of the spring 13 so that the steel ball 11 is moved to the inner diameter of the large diameter portion 15 a of the sleeve 14. Position, the outer diameter of the connecting portion 7 of the lens portion 2 can be inserted and fitted into the inner diameter of the connecting portion 7 of the camera body 1 while each of the steel balls 11 is free in the radial direction, and After the lens portion 2 is fitted to the camera body 1, the sleeve 14 is released from the elastic force of the spring 13 against the elastic force of the spring 13, thereby releasing the sleeve 14 from the elastic force of the spring 13. And move forward, sleeve 1
4, the steel balls 11 are pressed toward the lens portion 2 by the inner diameter of the small diameter portion 15b, and fall into the circumferential grooves 12 on the lens portion 2 side. Groove 12
At the same time, each steel ball 11 is slidable in the circumferential direction in the circumferential groove 12, the lens unit 2 is rotatably connected to the camera body 1 side, and the sleeve 14 is 13, the steel balls 11 are positioned in the inner diameter of the large-diameter portion 15a of the sleeve 14 so that the steel balls 11 are free in the radial direction and the lens portion 2 is retracted. Release from the engagement with the circumferential groove 12 on the side, pull out the outer diameter of the connecting portion 7 of the lens portion 2 from the inner diameter of the connecting portion 7 of the camera body 1, and detach the lens portion 2 from the camera body 1 side. It is characterized in that it is configured so that

Further, a resistance member capable of generating a rotational resistance between the connection portions is provided in the connection portion, and the position is fixed by restricting the freedom of rotation by the resistance member. Enabled. Further, as this resistance member, an O-ring having required elasticity and frictional resistance was used.

According to the CCD camera of the present invention, the lens portion is rotatably connected to the camera body having a built-in CCD element, so that the TV monitor can be provided simply by relatively rotating the connecting portions of the CCD camera. An image in a desired direction can be projected. In addition, the angle at which the CCD camera is rotated at the connecting portion can be confirmed by an angle scale provided between the connecting portions, and the angle rotated by the frictional resistance of the fixing member can be fixed at that position. The rotation angle stabilizes.

[0010]

1 to 3 show an embodiment of the present invention. FIG. 1 is a partial sectional view showing a connecting portion between a camera body and a lens unit of a CCD camera, and FIG. FIG. 3 is a partially enlarged sectional view, and FIG. 3 is a side view showing the entire CCD camera.

The CCD camera according to the present invention includes a connecting portion 7
In the above, the outer diameter of the lens unit 2 is fitted to the inner diameter of the camera body 1 for connection. The configuration of the connecting portion 7 in this case is the same as that of the cylindrical connecting portion 7 of the camera body 1.
In FIG. 1, a plurality of tapered through holes 10 (FIG. 2) each having a smaller diameter from the outer diameter side toward the inner diameter side are formed along the circumference, and steel balls 11 are put into the through holes 10. on the other hand,
On the lens portion 2 side, an arc-shaped circumferential groove 12 is formed at a position corresponding to the through hole 10 on the camera body 1 side on the outer peripheral surface of the cylindrical connecting portion 7 fitted to the inner diameter of the camera body 1 side. .

Then, a lens unit 2 is provided with respect to the camera body 1.
The steel ball 11 inserted into the through hole 10 is dropped into the circumferential groove 12 on the lens unit 2 side while the sleeve 14 is fitted, and at the same time, the sleeve 14 pressed against the lens unit 2 side by the spring 13 (FIG. The steel ball 11 is pressed into the groove 12 at the inner diameter portion 15b of (2).

The through hole 10 into which the steel ball 11 is inserted is
In order to prevent the steel ball 1 from falling off to the inner diameter side of the cylindrical portion when the lens portion 2 is not connected to the camera main body 1 side, the diameter of the small diameter side is formed into a tapered hole smaller than the diameter of the steel ball 11. Let me.

Then, the camera body 1 in the connecting portion 7
A cylindrical portion 16 not covered by the sleeve 14 is extended at an end of the cylindrical portion 16, and an origin 17 of rotation is displayed on a circumferential surface of the cylindrical portion 16. A cone-shaped inclined surface 18 is provided at a portion corresponding to the origin 17 of the camera, and an angle scale 19 obtained by dividing the circumference into 360 degrees is displayed on the inclined surface 18. It should be noted that the angle scale 19 is displayed with + and-directions on the left and right around the origin O.

An inclined surface 20 is provided on an end surface of the cylindrical portion 16 of the camera body 1, and the lens portion 2 corresponding to the inclined surface 20 is provided.
An arc-shaped circumferential groove 21 is formed on the side, and a fixing member 22 having desired elasticity and frictional resistance is disposed between the inclined surface 20 and the circumferential groove 21. It is configured such that a required frictional resistance is generated by pressing the base 22. In this case, as the fixing member 22, an O-ring 22 made of oil-resistant rubber was used.

The operation of the CCD camera having this configuration will be described below. First, a side-view lens is connected to the camera body 1 as the lens unit 2 for observing the inside of the oral cavity. In this connection, the sleeve 14 of the camera body 1 is retracted by hand against the elastic force of the spring 13. As a result, the steel ball 11 is located at the position of the inner diameter indicated by the large diameter portion 15a of the sleeve 14, and the steel ball 11 is free in the radial direction, so that the outer diameter of the connecting portion 7 of the lens portion 2 is connected to the camera body 1. It becomes possible to insert and fit into the inner diameter of the part 7.

After the lens portion 2 is fitted to the camera body 1, when the sleeve 14 is released from the hand, the sleeve 14 moves forward by the elastic force of the spring, and the steel ball has an inner diameter indicated by the small diameter portion 15b of the sleeve 14. 11 is pressed into the lens unit 2 side, and falls into the groove 12 on the lens unit 2 side. This makes steel ball 1
Reference numeral 1 simultaneously engages the through hole 10 and the circumferential groove 12 to complete the connection.

When the lens portion 2 is to be detached from the camera body 1, the steel ball 11 is retracted against the elastic force of the spring, so that the steel ball 11 has an inner diameter indicated by the large diameter portion 15a of the sleeve 14. And becomes free in the radial direction and is released from the engagement of the groove 12 on the lens unit 2 side. As a result, the lens unit 2 can be pulled out.

[0019]

According to the present invention, an image observed at an arbitrary angle can be converted into a desired direction by arranging a connecting portion between a camera body and a lens portion of a CCD camera so as to be rotatable and detachable. Can be displayed on a TV monitor. Further, since the rotation angle can be fixed at an arbitrary position, the angle is stabilized, and the rotated angle can be checked on an angle scale. With this, CCD
If you set the rotation angle of the camera as before and shoot,
It is possible to reproduce the same video as the previous one. Also,
By displaying the image converted in the desired direction on the TV monitor, communication with the patient can be facilitated.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing a connecting portion between a camera body and a lens unit of a CCD camera of the present invention.

FIG. 2 is a partially enlarged sectional view of a connecting portion.

FIG. 3 is a side view showing the entire CCD camera.

FIG. 4 is a schematic sectional view of a conventional CCD camera.

FIG. 5 is a sectional view of a direct-view lens unit.

FIG. 6 is a diagram illustrating fixing of a connecting portion between a camera body and a side-view lens unit.

FIG. 7 is a diagram showing a relationship between an observation angle and an image angle by a CCD camera.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Camera main body 2 Lens part 7 Connecting part 9 TV monitor 10 Through hole 11 Steel ball 12, 21 Circular groove 13 Spring 14 Sleeve 15a Large diameter part 15b Small diameter part 16 Cylindrical part 17 Origin 18, 20 Inclined surface 19 Angle scale 22 Resistance Element

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI G03B 17/02 G03B 17/02 (56) References JP-A-6-209904 (JP, A) JP-A-1-313522 (JP) JP-A-1-293840 (JP, A) JP-A-62-3910 (JP, A) JP-A-4-110909 (JP, A) JP-A-62-38616 (JP, U) (58) Field surveyed (Int.Cl. ⁷ , DB name) G03B 17/14 G02B 7/02 G02B 23/24 G03B 15/00 G03B 17/02 A61B 1/04 360

Claims (3)

(57) [Claims] 1. A camera body 1 having a built-in CCD element,
The lens unit 2 such as a side-view lens unit or a direct-view lens unit is connected so that an observation image can be displayed on a TV monitor. In the dental CCD camera in which the camera body 1 and the lens unit 2 are configured to be relatively rotatable by fitting and connecting the outer diameters of the unit 7, A plurality of tapered through-holes 10 each having a smaller diameter from the radial side to the inner diameter side are formed along the circumference, steel balls 11 are inserted into each through-hole 10, and the inner diameter of the connecting portion 7 of the camera body 1 is increased. An arc-shaped circumferential groove 12 is formed at a position corresponding to each through-hole 10 of the camera body 1 on the outer peripheral surface of the connecting portion 7 of the lens unit 2 fitted to the lens body 2. With each of the through holes 0 and at the same time depress the steel ball 11 which is placed in a circumferential groove 12 of the lens portion 2, the inner diameter portion 15b of the sleeve 14 which is pressed against the lens portion 2 side by a spring 13
Each of the steel balls 11 is pressed into the circumferential groove 12, and the sleeve 14 on the side of the camera body 1 is retracted against the elastic force of the spring 13 so that the steel balls 11 are
4, the outer diameter of the connecting portion 7 of the lens portion 2 is inserted into the inner diameter of the connecting portion 7 of the camera body 1 while leaving the steel balls 11 free in the radial direction. After the lens portion 2 is fitted to the camera body 1, the force for retreating against the elastic force of the spring 13 with respect to the sleeve 14 is released to release the sleeve. 14 is advanced by the elastic force of the spring 13,
Each of the steel balls 11 is set at the inner diameter of the small diameter portion 15b of the sleeve 14.
Is pressed into the lens unit 2 side, and the circumferential groove 1 on the lens unit 2 side is pressed.
2, each steel ball 11 is simultaneously locked with the through hole 10 and the circumferential groove 12, and each steel ball 11 is slidable in the circumferential direction in the circumferential groove 12. Camera body 1
The steel ball 11 is positioned at the inner diameter of the large diameter portion 15a of the sleeve 14 by rotatably connecting the lens portion 2 to the side of the sleeve 14 and retracting the sleeve 14 against the elastic force of the spring 13. As a result, each steel ball 11 becomes free in the radial direction and is released from the engagement with the circumferential groove 12 on the lens portion 2 side, and the connecting portion of the lens portion 2 is connected to the inner diameter of the connecting portion 7 of the camera body 1. 7. A dental CCD camera characterized in that the outer diameter of 7 is pulled out and the lens unit 2 can be detached from the camera body 1 side. 2. A connection portion between the camera body and the lens portion is relatively rotatably connected, and an origin is displayed on the camera body side to confirm a relative rotation angle;
2. The dental CCD camera according to claim 1, wherein an angle scale is displayed on the lens unit side so as to confirm a relative position shift corresponding to the origin. 3. A connection part between the camera body and the lens part is rotatably connected to each other, and rotation resistance is generated between the connection parts to fix a relative position of the connection part. 3. The dental CCD camera according to claim 1, further comprising a resistance member.