JPS6012087Y2 - Connector device for illumination light transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a connector device for transmitting illumination light used in an endoscope device.

Generally, an endoscope apparatus has a light guide cable connected to its operating section, and a connector of the light light guide cable is connected to a socket of a light source device to obtain illumination light.

By the way, various types of connector parts are known, but as shown in FIG. By connecting the light guide fiber bundle 1 and using the single light transmission #3 as the end face of the connector part 2, the light amount ρb can be eliminated, and the light guide fiber bundle 10 can be connected to the light guide fiber bundle 10.
“Incidence end”.

Some have been developed that allow surfaces to be protected from thermal damage.

However, in the above method, the single optical transmission body 3 inserted into the connector frame 4 is fixed with the screw 5, and the O-ring 6 is interposed between the connector frame 4 and the single optical transmission body 3. Since the connector part 2 has a structure that provides airtightness, the single optical transmitter 3 and the manector frame 4 are separated at the end surface 2a.
A gap is formed between the The shortcomings of the connector frame and optical transmission are that the body evaporates rapidly, damaging the single optical transmitter and contaminating the end face of the single optical transmitter 3. An example of this is shown in Figures 2 and 3, which attempts to provide illumination light that can be penetrated by completely occluding the body wall.

: In the figure, 11 is an endoscope, and 12 is a light guide fiber bundle, and 4 is connected to 5, guide, and 5. A connector 15 is attached to the end of the cable 13, and the connector 15 is connected to the socket 16 of 14 so that IP1 calls can be made freely.

Further, the main light source equipment 11 and the light source amplifier 18 are also assembled.

On the other hand, a connector frame 21 is provided protruding from the □ end face of the connector, and within this connector frame 21 is a cylinder 22 formed of a heat-resistant synthetic resin such as fluororesin, which has a lower refractive index than quartz or glass material. Fitted with a snug fit.

A rod-shaped body 23 whose bottom is made of quartz or glass and whose outer peripheral surface is polished is fitted into the cylindrical body 22 with a tight fit.

A light transmitting body 24 is formed by this rod-shaped body 23 and the cylindrical body 22.
is configured.

The front end surfaces of the connector frame 21, the cylindrical body 22, and the rod-shaped body 23 are substantially on the same plane, and the rear end surface of the rod-shaped body 23 is aligned with the end surface of the light guide fiber bundle 25.

Further, the refractive index of the cylinder 22 is made lower than the refractive index of the rod-shaped body 23, and the light entering from the end face of the rod-shaped body 23 is transmitted to the boundary surface 2.
6, it is totally reflected.

Further, the diameter of the rod-shaped body 23 and the effective diameter of the light guide fiber bundle 25 are made the same, and furthermore, the diameter of the rod-shaped body 23 and the effective diameter of the light guide fiber bundle 25 are
The refractive index of 3 is selected to be approximately the same as the refractive index of the fibers of the light guide fiber bundle 25.

In the above-described configuration, when the light source lamp 18 is turned on, the light is reflected by the reflecting mirror 17 as shown by the arrow, and then enters the rod-shaped body 23 via the lens 19, and the entire light is reflected at the boundary surface 26 of the rod-shaped body 23. reflected and transmitted without loss,
Thereafter, the light is incident on the end face of the light guide fiber bundle 25 and sent to the irradiated area.

During the above-mentioned transmission of light, the light that is incident on the rod-shaped body 23 and transmitted has approximately the same refractive index as the light guide fiber bundle 25 due to the difference in refractive index between the rod-shaped body 23 and the cylinder 22. The light is no longer transmitted in the middle of the rod-shaped body 23.

Therefore, only the light transmitted by the light guide fiber bundle is transmitted to the end surface of the light guide fiber bundle 25, and no excess heat is transmitted to the end surface of the light guide fiber bundle 25.

Therefore, since the light guide fiber bundle 25 is generally bonded with an epoxy adhesive or the like, its heat resistance is low;
Since much of the heat is cut off by the rod-shaped body 23, damage caused by heat is eliminated.

Further, the end surface 15a of the connector portion 15 is substantially flat,
In addition, since the mating surfaces of the connector frame 21, cylinder 22, and rod-shaped body 23 are in close contact with each other, even if dust or liquid adheres to the end surface 15a, it can be wiped off and the entrance surface of the rod-shaped body 23 is not damaged. It won't get dirty or dirty.

Note that the present invention is not limited to the above embodiment,
The rear end of the cylindrical body 31 may be extended, and the tip of the light guide fiber bundle 25 may be fitted into the rear end of the cylindrical body 31 with a tight fit.

According to this embodiment, the central axis of the rod-shaped body 23 and the central axis of the light guide fiber bundle 25 can be made to coincide with each other with little error, making it possible to further reduce light transmission loss.

As explained above, in the present invention, a cylindrical body made of a heat-resistant synthetic resin with a refractive index lower than that of a glass material is fitted into the connector frame with a tight fit, and a rod-shaped body made of a glass material is fitted into the cylindrical body with a tight fit. Since the combined optical transmission body is constructed, not only can the end face of the light guide fiber bundle be prevented from being damaged by the heat of the light source, but also the end face of the connector part by the cylindrical body can be made airtight, preventing dust and liquid from entering. Damage and stains can be prevented.

In addition, the cylindrical body acts as a cladding for the optical transmission body, reducing costs.Furthermore, the cylindrical body can absorb the difference in thermal expansion coefficient between the connector frame and the rod-shaped body due to heat, preventing damage to the rod-shaped body. This has the effect that it can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing a conventional example, Fig. 2 and Fig. 3 show an embodiment of the present invention, Fig. 2 is a perspective view showing an endoscope device, and Fig. 3 is a main part. FIG. 4 is a longitudinal sectional view showing another embodiment of the present invention. 21... Connector frame, 22, 31...
Cylindrical body, 23... Rod-shaped body, 24... Light transmission body.

Claims (2)

[Scope of utility model registration request] (1) A connector frame, a cylindrical body made of a heat-resistant synthetic resin with a refractive index lower than that of glass material, which is fitted with an interference fit within the connector frame, and a rod-shaped body made of glass material which is fitted with an interference fit into this cylindrical body. 1. A connector device for illumination light transmission, characterized in that it consists of an optical transmission body consisting of: (2) The connector device for illumination light transmission according to claim (1), wherein the cylindrical body is made of a heat-resistant synthetic resin with a refractive index lower than that of quartz, and the rod-shaped body is made of quartz.