JPH0637805U - Reflector mounting structure for surface light source - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention aims at a reflector mounting structure for a surface light source that can prevent the discharge state from becoming unstable in the case of a fluorescent lamp having a small tube diameter. [Structure] Fluorescent lamp 14 with a small tube diameter, for example φ4 or less
Is a light guide plate type surface light source in which a lamp reflector 16 made of a dielectric material is arranged around the fluorescent lamp 14, and the inner diameter is substantially the same as the outer diameter of the fluorescent lamp 14 and the outer diameter is the lamp reflector 16. A ring member 17 having a diameter substantially the same as the inner dimension is assembled in the middle of both electrodes of the fluorescent lamp.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a reflector mounting structure for a surface light source used in a lighting device using a fluorescent lamp.

[0002]

[Prior art]

 In the conventional structure for mounting a reflector for a surface light source that uses a fluorescent lamp 4 having a diameter of φ4 or more, a reflector 5 for a fluorescent lamp (lamp reflector) used as a surface light source of the light guide plate 3 is shown in FIGS. As mentioned above, a white film or a silver-colored mirror film with low strength is used. In this case, since the film is curled and adhered to the light guide plate 3, it is difficult to arrange the fluorescent lamp 4 and the lamp reflector 5 at a constant distance.

That is, even if the fluorescent lamp 4 and the lamp reflector 5 come into contact with each other at a certain place, the fluorescent lamp having a diameter of φ4 or more does not significantly affect the characteristics of the lamp.

[0004]

[Problems to be solved by the device]

 However, when the diameter (outer shape) of the fluorescent lamp is as small as φ3.1, there is a problem that the impedance of the lamp itself is very high and the discharge state tends to become unstable. That is, when a fluorescent lamp with a thin tube diameter of φ3.1 is used, the structure is designed to keep the distance between the fluorescent lamp and the lamp reflector of the nearby conductor as constant as possible. Otherwise, the change in stray capacitance between the fluorescent lamp and the lamp reflector will be large, which will have a large effect on the discharge state.

In this case, in an extreme case, the lamp cannot be completely discharged, and eventually, the closer the lamp and the lamp reflector of the conductor are to each other, the more difficult it is for an electric current to flow in the lamp, and There is a problem that the brightness is lowered.

Therefore, the present invention has been devised in view of the above-mentioned problems of the conventional technique, and provides a reflector mounting structure for a surface light source capable of preventing the discharge state from becoming unstable in the case of a fluorescent lamp having a small tube diameter. It is an object.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, in the reflector mounting structure for a surface light source in the present invention, a fluorescent lamp having a small tube diameter, for example, φ4 or less is used, and a lamp reflector made of a dielectric material is arranged around the fluorescent lamp. This is a light guide plate type surface light source to be installed, and an inner diameter is made to be almost the same as the outer diameter of the fluorescent lamp, and a ring member with an outer diameter that is almost the same as the inner diameter of the lamp reflector is attached to the middle of both electrodes of the fluorescent lamp. It becomes.

The width of the ring member is 5 mm or less, the material is transparent or semi-transparent, and the hardness of the ring member is 40 to 80 °.

[0009]

[Action]

 Since the ring member is assembled, when the current of the fluorescent lamp is the set value of 5 mA, the variation of 3.5 mA to 6.5 mA in the conventional product falls within 4.5 to 5.5 mA.

[0010]

【Example】

 An example will be described with reference to FIGS. 1 to 3. A fluorescent lamp 14 having a thin tube diameter of φ3.1 is used, and a diffusion sheet 11 is provided on the surface of an acrylic light guide plate 13. In addition to the arrangement, the reflection sheet 12 is arranged on the back surface so that the light of the fluorescent lamp 14 is incident from the side.

Around the fluorescent lamp 14, an aluminum lamp reflector 16 having a mirror-like inner surface is arranged in order to increase the incidence efficiency of the fluorescent lamp.

The thickness of the plate material of the lamp reflector 16 is t = 0.2 mm, and in order to prevent the shape of the lamp reflector 16 from changing during assembly, almost no space is provided between the electrodes 15 of the fluorescent lamp 14. A ring-shaped ring member 17 having a through hole 18 formed in the center is assembled.

The ring member 17 is made of Teflon-based or silicon-based material having relatively high transparency and softness, and the inner diameter of the ring member 17 is formed to be approximately the same as the diameter of the fluorescent lamp 14. At the same time, the outer diameter is formed to be substantially the same as the inner dimension of the lamp reflector 16, so that the distance between the fluorescent lamp 14 and the lamp reflector 16 can be kept constant.

Moreover, depending on the length of the fluorescent lamp 14, one or more ring members 17 can be used.

Further, the width of the ring member 17 was set to about 2 mm, but it was confirmed by an experiment that if it is 5 mm or less, there is no influence on the light unevenness as the surface light source.

Although the ring member 17 is made of a material that transmits light in consideration of the influence on light unevenness, the same effect can be expected even if it is opaque or the ring width is reduced.

Further, the ring member 17 is formed in a ring shape because there is no mounting direction of the fluorescent lamp 14 and the lamp reflector 16 and the assembling workability is good. However, due to the detailed design, the shape of the lamp reflector 16 is It may be a shape that matches the shape of the light guide plate.

The strength of the material of the ring member 17 is 40 to 80 degrees in order to alleviate the heat shrinkage or external shock due to the temperature of the glass fluorescent lamp 14.

[0019]

[Effect of device]

 Since the present invention is configured as described above, since the ring member is assembled to the fluorescent lamp, when the current of the fluorescent lamp is the set value of 5 mA, the conventional product has 3.5 mA to 6. What has varied up to 5 mA can be set within 4.5 to 5.5 mA.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a surface light source device of the present invention.

FIG. 2 is a sectional view of a ring member of the present invention.

FIG. 3 is a front view of the ring member of the present invention.

FIG. 4 is a perspective view of a conventional surface light source device.

5 is a sectional view taken along line AA of FIG.

[Explanation of symbols]

 11 Diffusion Sheet 12 Reflection Sheet 13 Light Guide Plate 14 Fluorescent Lamp 15 Lamp Socket 16 Lamp Reflector 17 Ring Member

Claims (1)

[Scope of utility model registration request] 1. A light guide plate type surface light source in which a fluorescent lamp having a small tube diameter, for example, φ4 or less is used, and a lamp reflector made of a dielectric material is arranged around the fluorescent lamp, the inner diameter being the outer diameter of the fluorescent lamp. A surface light source reflector mounting structure in which a ring member that has a diameter approximately the same as that of the lamp reflector and an outer diameter that is approximately the same as the inner diameter of the lamp reflector is assembled in the middle of both electrodes of the fluorescent lamp.