JPH054684Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to an illumination device suitable as a light source for an exposure device or a printing device such as an electronic copying machine.

(Prior Art) For example, as an exposure light source for an electronic copying machine, a tubular incandescent light bulb, particularly a tubular halogen bulb, is used to illuminate a wide copy base paper. The light emitted from this halogen bulb is reflected by a gutter-shaped reflecting mirror and illuminates the copy base paper. For this reason, the halogen bulb must be installed at a predetermined position, such as in alignment with the focal position of the reflecting mirror.

Conventionally, a structure shown in FIG. 3 has been used as a means for installing a tubular halogen light bulb at a predetermined position on the reflecting mirror. That is, reference numeral 1 is a tube-shaped halogen light bulb, in which a filament 2 is stretched along the tube axis within a straight tube-shaped bulb made of quartz glass, and pinch seal portions 3, 3 formed at both ends of the bulb,
It is constructed by joining bases 4, 4 made of an insulator such as ceramic, and leading out lead wires 5, 5 electrically connected to the filament 2 from these bases 4, 4.

Reference numerals 6 and 6 denote chassis installed opposite each other, and these chassis 6 and 6 are formed with cutout grooves 7 and 7 into which the bases 4 and 4 are fitted. A reflecting mirror 8 is installed between these chassis 6, 6.

The tubular halogen light bulb 1 is spanned over the chassis 6, 6 by fitting the bases 4, 4 into the notch grooves 7, 7 of the chassis 6, 6, and the locking protrusions 8 of the chassis 6, 6... It is pressed down by springs 9, 9 hooked on the chassis 6,
It is attached to 6.

With such a structure, the tubular halogen light bulb 1 is attached to the chassis 6 by placing the bases 4 in the notched grooves 7 and pressing them with springs 9 made of leaf springs, wires, etc. By forming the cutout grooves 7, 7 at predetermined positions with respect to the reflecting mirror 8, positioning of the light bulb 1 becomes easy.
Moreover, the light bulb 1 can be easily attached and detached.

(Problem to be solved by the invention) However, in the case of the above conventional structure, the cap 4,
Since the shape of the bulb 4 is a perfect circular cylinder, there is a disadvantage that the bulb 1 tends to rotate around the tube axis.
In other words, in the case of a copying machine, the light source side or the table side on which the original copy paper is placed scans the light by moving back and forth relative to each other.
Vibrations due to running movement and shocks from stopping may occur, and these vibrations and shocks may cause damage to the chassis 6, 6.
and transmitted to light bulb 1. For this reason, in the conventional type in which the perfectly circular caps 4, 4 are fitted into the triangular notch grooves 7, 7, the bulb 1 is centered on the tube axis despite being pressed by the springs 9, 9. It may rotate as.

The filament 2 is designed to be placed on the tube axis of the valve, but the manufacturing and
Due to variations in assembly, some light bulbs are not positioned correctly on the tube axis, and when such a light bulb 1 rotates, the position of the filament 2 becomes misaligned with respect to the focal position of the reflector 8, and the light distribution characteristics change. Resulting in.

Therefore, the present invention aims to provide a lighting device in which a tube-shaped light bulb is supported without rotating.

[Structure of the idea]

(Means and effects for solving the problems) The present invention provides a tube-shaped light bulb that has sealing parts formed at both ends and caps attached to these sealing parts, and is attached to a chassis via these caps. In the lighting device, the base of the tubular light bulb is removably fitted into the chassis to form a locking groove, and at least one of the bases is formed in a non-circular shape so that it cannot rotate within the locking groove. The cap is characterized in that it is pressed by a spring attached to the chassis so as to prevent it from slipping out of the locking groove.

According to this configuration, since at least one of the caps is formed into a non-circular shape, the cap cannot rotate within the locking groove, and the light bulb is prevented from rotating. Furthermore, the base is pushed by a spring attached to the chassis and engaged with the locking groove, which not only makes it easy to attach and remove the bulb, but also prevents the non-circular base from moving or vibrating within the locking groove. Therefore, the support structure of the cap is extremely simple.

(Embodiment of the invention) The invention will be described above based on an embodiment shown in FIGS. 1 and 2.

In this embodiment, members that are the same as those in the prior art are given the same numbers and their explanations will be omitted.

In the tubular halogen light bulb 1 of this embodiment, one base 10 is formed into a rectangular shape as shown in FIG. The cutout groove 11 (corresponding to the locking groove of the present invention) of one of the chassis 6 into which the cap 10 is fitted is a square groove.

According to such a configuration, when the light bulb 1 is attached to the chassis 6, 6, one of the bases 10 fits into the notch groove 11, and both the base 10 and the notch groove 11 have a rectangular shape. Therefore, the light bulb 1 does not rotate around the tube axis.

Moreover, since the base 10 is pushed from the opening direction of the notch groove 11 by the spring 9 whose both ends are locked to the chassis 6, it does not escape from the notch groove 11. In this case, the spring 9 prevents the non-circular base 10 within the notch groove 11 from moving or vibrating.

Furthermore, since the base 10 is fixed to the chassis 6 by the pressure exerted by the spring 9, not only is it easy to attach and detach the light bulb 1, but also the support structure for the base 10 is simple.

Therefore, even if vibrations or shocks are transmitted, the filament 2 will not rotate and the light distribution characteristics will not be distorted.

Furthermore, when the light bulb 1 tries to move in the axial direction,
Since the flanges 12, 12 formed on the caps 4, 10 abut against the chassis 6, 6, displacement in the axial direction is also prevented.

Further, in the above embodiment, one of the caps 10
is square, and the other cap 4 is a perfect circle, so
The axial mounting posture when the light bulb 1 is mounted on the chassis 6, 6 is regulated. That is, when manufacturing the light bulb 1, the tension may vary between the filament at one end and the filament at the other end. All of the finished products of such light bulbs have irregular light distribution characteristics in the left and right directions. Therefore, by always attaching one end of the light bulb 1 to one chassis 6, it is possible to prevent the light distribution characteristics from changing due to the above-mentioned habit when the lamp is replaced. For this reason, if the caps 10 and 4 are of different shapes, the direction of the lamp can be regulated when installed on the chassis 6, 6.

However, in the present invention, both caps may have a shape other than a perfect circle, that is, a non-perfect circle.

[Effects of the invention] As explained above, according to the invention, since at least one of the caps is non-circular, the light bulb does not rotate around the tube axis when attached to the chassis. Even if vibrations or shocks are transmitted, the light distribution characteristics do not change.

Moreover, the base is pressed by a spring supported by the chassis so that it does not escape from the locking groove, preventing the base from moving or vibrating, and the base is fixed to the chassis by the pressure of such a spring. The bulb is easy to attach and detach, and the base support structure is simple.

[Brief explanation of the drawing]

1 and 2 show one embodiment of the present invention, FIG. 1 is a perspective view, FIG. 2 is a side view in the direction of FIG. 1, and FIG. 3 is a perspective view showing a conventional structure. . 1...Tubular halogen light bulb, 2...Filament, 3...Pinch seal portion, 4, 10...Base,
6, 6... Chassis, 11... Notch groove (mounting part),
8...Reflector, 9...Spring.

Claims (1)

[Scope of Claim for Utility Model Registration] A lighting device in which a tube-shaped light bulb having sealing parts formed at both ends and caps attached to these sealing parts is attached to a chassis via these caps, The base of the tube-shaped light bulb is removably fitted to form a locking groove, and at least one of the bases is formed in a non-circular shape that cannot rotate within the locking groove, and the base is attached to the chassis. A lighting device characterized in that it is pressed by an attached spring so as to prevent it from slipping out of a locking groove.