JPH0138870Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a fluorescent lamp illumination device used as a light source for a microscope or the like.

[Conventional technology]

For example, as an illumination device used as a light source for a microscope, a small, ring-shaped fluorescent lamp 1 has conventionally been used, as shown in FIGS. 4 and 5.

The annular fluorescent lamp 1 has both ends of an annular bulb bent into a substantially L-shape, and a U-shaped cap 2 made of an insulating material such as synthetic resin is attached to span between these bent ends. be. Four contacts 3 are provided on the lower surface of the cap 2 in the figure, and each contact 3 is connected to an electrode 5 in the bulb via a lead wire 4.
5.

Such an annular fluorescent lamp 1 is connected to a power source through an electronic lighting circuit.
These electronic lighting circuit components are installed on the illustrated ring-shaped circuit board 6. Note that illustration of electronic lighting circuit components is omitted.

Four power supply terminals 7 are attached to the circuit board 6, and these power supply terminals 7 are connected to the electronic lighting circuit components. Each power supply terminal 7... is made of an elastic piece such as a leaf spring material, and one end thereof is fixed with a rivet 8.
The circuit board 6 is fixed at . . . , and the other end thereof is raised from the upper surface of the circuit board 6 as shown in the figure, so that it can be elastically deformed.

The annular fluorescent lamp 1 has the lower surface of the base 2 facing the circuit board 6, and the contacts 3 are brought into contact with the power supply terminals 7, respectively, and the power supply terminals 7 are elastically deformed, so that the return force is used and is connected to the power supply through the electronic lighting circuit. In the annular fluorescent lamp 1 in such a connected state, the screws 11, 11 are inserted into the connecting holes 9, 9 formed in the cap 2 and the fixing holes 10, 10 formed in the circuit board 6, and the nuts 12, 12 are inserted. It is designed to be fixed.

Incidentally, the bulb itself is held by a lamp holder 13 attached to the circuit board 6, and is maintained in an attitude substantially parallel to the circuit board 6.

Conventional fluorescent lamp lighting devices with such a configuration are subject to shocks and vibrations,
If uneven tightening of the screws 11 and 11 occurs, the fluorescent lamp 1 and the circuit board 6 will tilt relative to each other, resulting in two-point or three-point contact, or even though they are in contact, each In some cases, problems such as variations in contact pressure occurred.

Needless to say, if the contacts 3 and the power supply terminals 7 come into two-point contact or three-point contact, lighting will not be possible. In the case of partial contact or contact with a difference in contact pressure as described above, excessive pressing force is applied to the strongly pressed power supply terminal 7, and this power supply terminal 7
... exceeds the amount of deformation that can be elastically restored, resulting in permanent deformation.

Also, when contact is made with a difference in contact pressure,
The power supply terminals 7, which are subjected to excessive pressing force when lamps are replaced repeatedly, suffer from problems such as becoming sagging due to fatigue and losing their elastic restoring force, or breaking due to repeated local stress.

[Problem that the invention attempts to solve]

The present invention was developed based on the above-mentioned circumstances, and its purpose is to compensate for the elastic return force of the power supply terminal, prevent excessive tilting of the lamp and prevent it from being unable to light, and to prevent permanent deformation of the power supply terminal. It is an object of the present invention to provide a fluorescent lamp lighting device that prevents damage and breakage.

[Means for solving problems]

In order to achieve the above object, the present invention is characterized in that an auxiliary cushion body made of an insulating material is interposed between the circuit board and the power supply terminal to assist the elastic return force of the power supply terminal.

[Effect]

According to the above configuration, the auxiliary cushion body assists the elastic return force of the power supply terminal, so even if the power supply terminal is strongly pressed, excessive deformation or permanent deformation does not occur, and excessive tilting of the lamp is prevented. In addition to maintaining contact between all the contacts, the fatigue rate is reduced even if the lamp is replaced repeatedly, and it is possible to prevent wear and breakage.

[Example of idea]

The present invention will be explained below based on an embodiment shown in FIGS. 1 to 3. In this example,
Components that are the same as those in the prior art shown in FIGS. 4 and 5 are given the same numbers and their explanations will be omitted.

In the figure, 20, 20 are auxiliary cushion bodies according to the present invention, and these auxiliary cushion bodies 2
0 and 20 are formed by, for example, so-called glass cloth silicone tubes in which synthetic resin or glass fibers are braided into a tube shape and covered with silicone, etc., and have insulation and elasticity. These auxiliary cushion bodies 20, 20 are held between the power supply terminals 7 and the circuit board 6 under the pressing force of the power supply terminals 7. In this embodiment, one auxiliary cushion body 20 is inserted across the two power supply terminals 7, 7.

According to such a configuration, when the lower surface of the cap 2 is opposed to the circuit board 6 and each contact 3 is brought into contact with the power supply terminal 7, the power supply terminal is 7 is elastically deformed. At this time, the auxiliary cushion bodies 20, 20 inserted into the operating spaces of the power supply terminals 7 are also pushed by the power supply terminals 7 and are elastically deformed.

Therefore, the power supply terminals 7 are applied with the elastic restoring force of the auxiliary cushion bodies 20, 20 in addition to their own elastic restoring force, so that they contact the contacts 3 with a strong force. As a result, high contact pressure can be obtained.

In addition, if shock or vibration is applied to the screw 11,
Due to the tightening variation of 11, the fluorescent lamp 1
Even if the lamp tries to tilt forward or backward or left and right relative to the circuit board 6, the power supply terminals 7 that have made two or three points of contact will return with a strong force, so that the inclination of the fluorescent lamp 1 can be corrected. This prevents the fluorescent lamp 1 from being excessively tilted, thereby eliminating local contacts such as two-point contact and three-point contact, thereby preventing the lamp from being unable to turn on.

Even if there is a difference in contact pressure between each contact part,
The difference in contact pressure is reduced in the same way as above.

Moreover, even if an excessive pressing force is applied to the power supply terminals 7, the elastic return force of the auxiliary cushion bodies 20, 20 is applied, so the power supply terminals 7 reliably return elastically, and no permanent deformation occurs. .

Furthermore, even if the power supply terminals 7 tend to become sagging due to fatigue due to repeated lamp replacements, the elastic restoring force of the auxiliary cushion bodies 20, 20 compensates for the fatigue of the power supply terminals 7, preventing sagging and repeating the process. Since the auxiliary cushion bodies 20, 20 bear a portion of the local load, breakage is less likely to occur and the service life is extended.

In addition, in the above embodiment, two power supply terminals 7, 7
Although one auxiliary cushion body 20 is inserted across the power supply terminal 7, one auxiliary cushion body 20 may be attached to each power supply terminal 7. It is more effective to attach one auxiliary cushion body to each power supply terminal 7 because each power supply terminal 7 receives the force from the auxiliary cushion body independently.

Further, in the above embodiment, an auxiliary cushion body formed of a glass cloth silicon tube was used, but the auxiliary cushion body may be made of silicone rubber, urethane gum, or the like.

Furthermore, the present invention is not limited to illumination devices used as light sources for microscopes, but can be implemented in any illumination device that satisfies the configuration of the present invention.

[Effect of idea]

As explained above, according to the present invention, the auxiliary cushion body made of an insulating material is interposed between the circuit board and the power supply terminal to assist the elastic return force of the power supply terminal. The elastic return force is now assisted, which not only prevents the lamp from tilting excessively and causing it to fail to light, but also prevents permanent deformation even if the power supply terminal is pushed too hard, and also prevents the lamp from being repeatedly replaced. The fatigue rate is also reduced, and it is possible to prevent deformation and breakage.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, in which FIG. 1 is an exploded perspective view, FIG. 2 is a plan view of the main parts of the circuit board, FIG. 3 is a cross-sectional view of the circuit board in a contact state, and FIG. 4 and 5 show a conventional structure, with FIG. 4 being an exploded perspective view and FIG. 5 being a sectional view in a contact state. 1... Fluorescent lamp, 2... Base, 3... Contact, 6... Circuit board, 7... Power supply terminal, 20...
Auxiliary cushion body.

Claims (1)

[Scope of utility model registration request] Four contacts connected to electrodes are arranged substantially on the same plane on the side of the cap attached between both ends of the annular fluorescent lamp, and these contacts are made of an elastic piece provided on the circuit board. In a fluorescent lamp lighting device in which power is supplied to a power supply terminal by contacting the power supply terminal in a direction in which the power supply terminal is elastically deformed, an insulating material is provided between the circuit board and the power supply terminal to assist the elastic restoring force of the power supply terminal. A fluorescent lamp lighting device characterized by interposing an auxiliary cushion body.