JP5202358B2 - Vibration control structure of light source device for endoscope - Google Patents

Description

  The present invention relates to a vibration damping structure for an endoscope light source device.

An endoscope light source device to which a connection end (connector portion) provided at an end of a universal tube of an endoscope is connected is generally a hollow box-shaped case, a light source provided in the case, a case A rotating chopper positioned between the light source and the connecting portion for connecting the connecting end portion formed on the motor, and a motor for rotating the rotating chopper provided in the case.
When the light source is turned on, the light beam emitted from the light source is directed to the connection end of the endoscope. Further, since the rotating chopper rotates on the light beam as the motor rotates, the light beam is intermittently interrupted by the rotating chopper. Therefore, the light beam emitted from the light source is supplied to the connection end portion of the endoscope while the amount of light is adjusted by the rotary chopper.

JP 2007-312929 A

Since the motor generates vibration during rotation, the entire case will resonate if no measures are taken against this vibration. When the case resonates, not only the noise exceeding the allowable level is generated, but there is a possibility that the light beam emitted from the light source cannot be accurately supplied to the connection end portion of the endoscope.
Therefore, conventionally, a support plate made of glass epoxy resin is fixed on the bottom plate of the case, and a motor, a light source, and the like are fixed on the support plate. Since the support plate made of glass epoxy resin has moderate hardness, it can support the motor and the light source in a stable state and has a function of absorbing the vibration of the motor. The above problem can be suppressed.
However, since glass epoxy resin is very expensive, when such a configuration is adopted, the manufacturing cost of the endoscope light source device is increased.

  An object of the present invention is to provide a vibration damping structure for an endoscope light source device that can efficiently absorb vibration generated by a vibration source in an endoscope light source device while having an inexpensive configuration.

The vibration damping structure for an endoscope light source device according to the present invention includes a bottom plate that forms a bottom portion of a case of the endoscope light source device, and a ceiling that is spaced upward from the bottom plate and supports the vibration source in the case. A base member having a plate portion and a mounting portion extending downward from the top plate portion and contacting the top surface of the bottom plate; and an upper surface located between the top plate portion and the bottom plate of the base member; A vibration damping member made of an elastic material, the lower surface of which is in contact with the opposing surfaces of the bottom plate and the top plate portion , and the upper surface of the vibration damping member is in contact with the lower surface of the top plate portion, and the lower surface of the vibration damping member. A base portion that is spaced apart from the upper surface of the bottom plate, a contact protrusion that protrudes downward from the lower surface of the base portion, and a lower surface that is in contact with the upper surface of the bottom plate; It is characterized in that it comprises, when.

It is preferable that the recess is an annular recess surrounding the entire outer periphery of the contact protrusion.

  An endoscope light source device is positioned on a light source and a light beam directed from the light source to a connection end of the endoscope connected to the endoscope light source device, and intermittently blocks the light beam by rotating. You may provide the rotation chopper and the motor as said vibration suppression source which rotates this rotation chopper.

According to the present invention, the damping member made of an elastic material is positioned between the bottom plate and the base member of the case that are in contact with each other, and the upper surface and the lower surface of the damping member are brought into contact with the opposing surfaces of the bottom plate and the top plate portion, respectively. Therefore, even if a vibration source (for example, a motor for rotating the rotary chopper) supported by the ceiling of the base member generates vibration, the vibration is absorbed by the vibration damping member. There is no resonance. Moreover, since the base member can be made of a hard material and is in contact with the bottom plate of the case, the vibration source can be stably supported by the base member.
Further, since the vibration damping member can be formed of a general elastic material (for example, silicon rubber), it can be manufactured at low cost. Therefore, it is possible to reduce the manufacturing cost of the endoscope light source device.

Furthermore, even if the damping member is formed so that the thickness (vertical dimension) of the base is clearly thinner than the dimension between the bottom plate and the top plate, the lower end of the contact protrusion can be reliably brought into contact with the bottom plate of the case. . Therefore, compared with the case where it shape | molds so that the thickness of a base part may become (substantially) the dimension between the facings of a baseplate and a top-plate part, shaping | molding becomes easy.
In addition, since the contact protrusion is easily elastically deformed, the damping function of the damping member is improved.
Furthermore, since the contact protrusion is more easily elastically deformed, the damping function of the damping member is further improved.

Furthermore, if the concave portion is an annular concave portion as in claim 2 , the contact protrusion is more easily elastically deformed, so that the damping function of the damping member is further improved.

It is a top view which fractures | ruptures and shows a part of the light source device for endoscopes of the 1st Embodiment of this invention. It is a vertical side view of the principal part of the light source device for endoscopes. It is sectional drawing which follows the III-III arrow line of FIG. It is a vertical side view similar to FIG. 2 of the second embodiment of the present invention. Similarly, it is an enlarged vertical sectional side view of the main part of the vibration damping member in a free state. Similarly, it is a bottom view of the damping member in a free state. It is a bottom view of the contact protrusion of the modification of the damping member of a 2nd embodiment, and its peripheral part. It is a vertical side view of another modification of the vibration damping member of the second embodiment.

The first embodiment of the present invention will be described below with reference to FIGS. The directions in the following description are based on the arrow direction in the figure (the same applies to the second embodiment).
The endoscope light source device 10 according to the present embodiment includes a hollow box type (cuboid) case 11. The case 11 is made of metal (for example, iron), and the bottom is constituted by a substantially horizontal bottom plate 12. The front plate 13 of the case 11 is formed with a circular small-diameter through hole 14. Further, nuts 17 are welded to five locations on the upper surface of the bottom plate 12 (only one is shown in FIG. 3).
On the upper surface of the bottom plate 12, a hollow base member 20 having only the lower surface opened is placed. The base member 20 is made of hard plastic (for example, a resin material in which ABS resin is mixed with polycarbonate), and has a substantially horizontal and rectangular ceiling portion 21 in plan view and a rectangular frame shape in plan view that hangs down from the entire peripheral portion of the ceiling portion 21. Peripheral edge hanging part (mounting part) 22. As shown in FIG. 3, five through holes 23 are formed at locations corresponding to the nuts 17 of the ceiling portion 21.
In the internal space of the base member 20, a damping member 25, which is a solid member having substantially the same shape as the internal space, is fitted. The damping member 25 is an integrally molded product made of silicon rubber, and is for screws that pass through the damping member 25 in the thickness direction (vertical direction) with a diameter larger than that of the nut 17 at five locations corresponding to the nut 17 and the through hole 23. A through hole 26 is formed.
As shown in the figure, a screw portion 32 of a fixing screw 30 having a head portion 31 having a diameter larger than that of the through hole 23 is inserted into each through hole 23 of the ceiling portion 21 and the corresponding screw through hole 26, and the screw portion 32 is The base member 20 and the damping member 25 are fixed to the bottom plate 12 by screwing with the corresponding nuts 17, and the lower surface of the peripheral hanging portion 22 is brought into contact with the upper surface of the bottom plate 12. The thickness (vertical dimension) of the damping member 25 in the free state is slightly larger than the vertical dimension of the internal space of the base member 20, but when the case 11 is fixed to the base member 20, the damping member 25 is slightly compressed in the vertical direction. The Therefore, the entire upper surface of the vibration damping member 25 is in contact with the lower surface of the ceiling portion 21, and the entire lower surface of the vibration damping member 25 is in contact with the upper surface of the bottom plate 12.

In the vicinity of the front end portion of the upper surface of the ceiling portion 21 of the base member 20, a metal fixing member 35 having an L shape in side view is fixed. A lower through hole (not shown) opposed to the small-diameter through hole 14 in the front-rear direction is formed in the lower portion of the vertical support piece 36 of the fixing member 35, and a support that communicates with the lower through hole on the rear surface of the vertical support piece 36. The cylinder 38 is fixed.
A light source fixing frame 40 is fixed to the rear portion of the upper surface of the ceiling portion 21, and a front through hole (not shown) is formed in the front wall portion of the light source fixing frame 40. A light source 41 made of a lamp is fixed inside the light source fixing frame 40, and the light source 41 faces the support cylinder 38 in the front-rear direction through the front through hole.
Further, a lens support member (not shown) positioned between the fixing member 35 and the light source fixing frame 40 is fixed to the upper surface of the ceiling portion 21, and the lens support member is coaxial with the support cylinder 38 and the light source 41. A condensing lens L formed is supported.
Further, a chopper support member (not shown) positioned between the lens support member and the light source fixing frame 40 is fixed to the upper surface of the ceiling portion 21, and the chopper support member is rotatable around the rotation axis A. The chopper 45 is supported (the rotation axis A is shifted laterally from the central axes of the support cylinder 38, the light source 41, and the condenser lens L). The rotating chopper 45 is formed by coaxially stacking a plurality of plates in which a part of a circular plate is cut out in a fan shape.
Further, a motor (vibration source) 50 for rotating each plate of the rotary chopper 45 is fixed to the upper surface of the ceiling portion 21. When the motor 50 rotates, the plates constituting the rotary chopper 45 rotate relative to each other (or rotate in the same direction at the same speed), so that an opening is formed between the plates. The rotating chopper 45 passes the light beam O directed from the light source 41 toward the condenser lens L while rotating, so that the amount of light supplied from the light source 41 to the condenser lens L changes as the rotating chopper 45 rotates.

Next, the operation of the endoscope light source device 10 according to the present embodiment will be described.
First, a light carrying bundle sleeve 61 provided on an end surface of a connector portion (connection end portion) 60 formed at an end portion of a universal tube of an electronic endoscope is vertically supported with a small-diameter through hole 14 of an endoscope light source device 10. It inserts into the lower through-hole of the piece 36 and the support cylinder 38, respectively. Inside the light carrying bundle sleeve 61, there is provided a light guide fiber bundle (not shown) whose front end is connected to an illumination lens provided at the tip of the insertion portion of the electronic endoscope, and the rear end surface of the light guide fiber bundle Is positioned coaxially in front of the condenser lens L through the rear end opening of the light carrying bundle sleeve 61. Accordingly, when the main switch of the endoscope light source device 10 is turned on to emit light from the light source 41 and the motor 50 is rotated, the light beam O generated by the light source 41 is condensed while being adjusted by the rotating chopper 45. The light enters the lens L and enters the rear end face of the light guide fiber bundle while being condensed by the condenser lens L. Therefore, an image captured by the imaging means provided at the distal end portion of the insertion portion of the electronic endoscope is displayed on the television monitor (not shown).

When vibration is generated by the rotation of the motor 50, this vibration is transmitted to the base member 20. However, most of the vibration is absorbed by the damping member 25 made of silicon rubber, so that the base member 20 and the case 11 do not resonate with the motor 50. Therefore, no loud noise is generated, and the noise is below an allowable level. Further, since the light source fixing frame 40 fixed to the upper surface of the base member 20, the lens support member, and the fixing member 35 do not shake greatly, the light beam O emitted from the light source 41 is transmitted to the rear end of the light carrying bundle sleeve 61. The light guide fiber bundle is reliably supplied from the opening to the rear end surface.
Moreover, since the base member 20 is made of hard plastic and the entire lower surface of the peripheral hanging portion 22 of the base member 20 is in contact with the upper surface of the bottom plate 12 of the case 11, the light source fixing frame 40 and the lens are The support member, the fixing member 35, and the motor 50 can be supported in a stable state.
Furthermore, since the damping member 25 is made of silicon rubber, which is an inexpensive material, the manufacturing cost of the endoscope light source device 10 as a whole can be reduced.

Subsequently, a second embodiment of the present invention will be described with reference to FIGS. The same members as those in the first embodiment are designated by the same reference numerals, and detailed description thereof is omitted.
The feature of the endoscope light source device 70 of this embodiment resides in the vibration damping member 75.
The damping member 75 is made of silicon rubber as in the first embodiment. The base portion 76 of the damping member 75 is a solid portion that has substantially the same planar shape as the internal space of the base member 20, but its thickness is smaller than the vertical dimension of the internal space of the base member 20. Further, a cylindrical contact protrusion 77 having a lower end projecting downward from the lower surface of the base 76 protrudes from the lower surface of the vibration damping member 75. The linear distance from the upper surface of the base 76 to the lower surface of the contact projection 77 when the vibration damping member 75 is in a free state is larger than the vertical dimension of the internal space of the base member 20. Further, an annular annular recess (recess) 78 is provided in the periphery of the base end of each contact projection 77 on the lower surface of the base 76. Although not shown, the base 76 has five screw through holes 26 similar to those of the vibration damping member 25.
Therefore, when the damping member 75 is fitted into the internal space of the base member 20 and the base member 20 is fixed to the bottom plate 12 by the fixing screw 30 in contact with the bottom plate 12, the entire upper surface of the base portion 76 becomes the ceiling portion as shown in FIG. 21, the entire bottom surface of the base 76 is spaced upward from the top surface of the bottom plate 12, and each contact projection 77 contacts the top surface of the bottom plate 12 while being elastically deformed in the compression direction.
The vibration damping member 75 of the present embodiment is formed so that the thickness (vertical dimension) of the base portion 76 is clearly thinner than the dimension between the bottom plate 12 and the ceiling part 21, so that the thickness is substantially the same as the dimension between the opposed parts. The molding is easier than the damping member 25 that must be performed.
In addition, since the annular recess 78 surrounding the contact protrusion 77 is formed on the lower surface of the base 76, the longitudinal dimension of each contact protrusion 77 is increased by the amount of the annular recess 78 formed. Therefore, since each contact protrusion 77 is easily elastically deformed in the compression direction, even if the cross-sectional area of each contact protrusion 77 is increased, the vibration suppression member 75 is better than the vibration suppression member 25. The vibration function can be demonstrated.
If the thickness of the base portion 76 is significantly smaller than the vertical dimension of the internal space of the base member 20, the damping function of the damping member 75 is lowered. Therefore, the thickness of the base portion 76 is as much as possible (in a range not contacting the bottom plate 12). It is preferable to approximate the vertical dimension of the internal space of the base member 20.

As mentioned above, although this invention was demonstrated based on 1st and 2nd embodiment, this invention can be implemented, giving various changes.
For example, the damping member 25 and the damping member 75 may be formed from an elastic material other than silicon rubber.
Further, a vibration source different from the motor 50 may be supported on the upper surface of the base member 20, and the light source 41 may be a light source (for example, LED) different from the lamp.
Further, the thickness (vertical dimension) of the vibration damping member 25 in the free state may be completely matched with the vertical dimension of the internal space of the base member 20.
Further, as shown in FIG. 7, two arcuate recesses (recesses) 79 positioned around the contact protrusion 77 are formed on the lower surface of the vibration damping member 75 at equal angular intervals in the circumferential direction of the contact protrusion 77. Also good. In this way, the number of recesses that are not annular may not be two, but when a plurality of recesses are formed, it is preferable to form them at equal angular intervals in the circumferential direction.
Further, as shown in FIG. 8, it may be carried out without forming a recess located around the contact protrusion 77 on the lower surface of the base portion 76.

DESCRIPTION OF SYMBOLS 10 Endoscope light source device 11 Case 12 Bottom plate 13 Front plate 14 Small diameter through-hole 17 Nut 20 Base member 21 Ceiling part 22 Peripheral hanging part (mounting part)
23 Through-hole 25 Damping member 26 Screw through-hole 30 Fixing screw 31 Head 32 Screw part 35 Fixing member 36 Vertical support piece 38 Support cylinder 40 Light source fixing frame 41 Light source 45 Rotating chopper 50 Motor (vibration source)
60 Connector (connection end)
61 Light carrying bundle sleeve 70 Endoscope light source device 75 Damping member 76 Base 77 Contact protrusion 78 Annular recess (recess)
79 Arc-shaped recess (recess)
A Axis of rotation L Condensing lens

Claims (3)

A bottom plate constituting the bottom of the case of the endoscope light source device;
A base member having a top plate portion spaced upward from the bottom plate and supporting a vibration source in the case, and a mounting portion extending downward from the top plate portion and contacting the top surface of the bottom plate;
A damping member made of an elastic material, which is located between the top plate portion and the bottom plate of the base member, and whose upper and lower surfaces are in contact with opposing surfaces of the bottom plate and the top plate portion, respectively.
Equipped with a,
The damping member is
A base portion whose upper surface is in contact with the lower surface of the top plate portion and whose lower surface is separated from the upper surface of the bottom plate;
A contact protrusion that protrudes downward from the lower surface of the base, and the lower surface contacts the upper surface of the bottom plate;
A recess formed on the lower surface of the base portion and positioned around the contact protrusion;
Damping structure for an endoscope light source apparatus comprising: a. In the vibration damping structure of the endoscope light source device according to claim 1,
A vibration damping structure for an endoscope light source device, wherein the recess is an annular recess surrounding the entire outer periphery of the contact protrusion . In the vibration damping structure of the endoscope light source device according to claim 1 or 2,
Endoscope light source device
A light source;
A rotating chopper positioned on the light beam from the light source to the connection end of the endoscope connected to the endoscope light source device, and intermittently blocking the light beam by rotating;
A motor as the vibration suppression source for rotating the rotary chopper;
Damping structure for an endoscope light source device comprising a.

Images