JPS6313303B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application] The invention relates to an outer periphery with an inner surface provided with a prismatic element for focusing transmitted light and a front and rear sealing surface joined at a body portion. The present invention relates to a modification of a lens member device for a sealed beam lamp device having a ceiling rim.

[Conventional technology]

Pressed glass sealed beam lamp devices are particularly useful in automotive headlights. Circular headlights with such a lens member structure have often been used in automobiles, and the hermetic seal can be applied without any particular difficulty, except when the sealing rim of the lens member is bent. can be applied. This defect when the sealing rim is bent is due to non-uniform thermal shrinkage of the lens member during initial molding. The front sealing surface of a curved lens member is not flat when placed in the same spatial plane. this is,
It is believed that this is due to thickness variations of the prism elements on the inner surface of the lens member.

[Problem that the invention seeks to solve]

The circular stamped lens member for the conventional sealed beam lamp device described above has a large fluted lens member that includes a rib element extending longitudinally along the inner surface, which is faster than the rest of the inner surface. There is a tendency to cool down, and the aforementioned drawbacks occur more frequently. A circular shaped stamped glass lens element with a curved sealing rim is hermetically sealed to the rim of a correspondingly shaped reflector element, typically used to provide a hermetically sealed seal. Aluminum surfaces are damaged by gas flames. Air gaps between the sealing surfaces reduce reliability in fused seals. There is a problem.

Remarkably, it has been found that undesirable deformations of lens member parts for stamped glass sealed beam devices can be compensated for by a special method that avoids the above-mentioned difficulties.

[Means for solving problems]

The circular pressed glass lens member for sealed beam lamps of the present invention has an inner surface having a prism element including a longitudinally extending rib for focusing transmitted light, and an outer peripheral sealing rim having front and rear sealing surfaces. , the thickness of the rim is made thicker at both end portions of the longitudinally extending rib than the thickness of the rim in the direction across the rib, and the outer peripheral sealing rim of the pressed glass reflective member facing the outer peripheral sealing rim is provided. It is constructed with a hermetic seal.

[Effect]

Therefore, for a circular pressed glass lens member, the thickness of the rim body can be changed to compensate for thermal shrinkage during molding, and the front sealing surface of the molded product can be placed in the same plane to avoid deformation. .

〔Example〕

Next, the present invention will be described based on examples with reference to the drawings.

In FIG. 1, representative prismatic elements 64, 6 are shown with an outer sealing rim 70 having a front sealing surface 72 and a rear sealing surface 74.
A circular pressed glass lens member 60 for a sealed beam lamp device is shown including an inner surface 62 having 6 and 68. The ceiling rim is
It further includes a body portion 76 having a thickness 76'' greater than the glass thickness 76'' in the lateral direction.
The thickness of the rim body is greater in the longitudinal direction of the rim than in the horizontal direction.
As a result of this thickness variation in the body of the lens member 60, it compensates for thermal shrinkage of the lens member when initially molded to place the front sealing surface 70 of the final member in the same spatial plane. be able to.

Next, to explain the degree of thickness change necessary to obtain this result in an automotive headlight with a rated diameter of 4 1/2 inches, the thickness 76'' of the main body of the lens member is 0.160 to 0.165. inch thick, while the horizontal body thickness 76 is maintained in the range 0.150 to 0.155 inch thick. Hermetic sealing with conventional glass reflector members having sealing rims fuses the glass material in the rim area of both members, providing a more reliable seal.

〔Effect of the invention〕

As can be seen from the foregoing description, an improved lens member structure is provided for a pressed glass sealed beam lamp device. It will also be apparent that various modifications may be made in the shape or thickness changes of the lens members specifically shown above without departing from the spirit and scope of the invention. For example, it is contemplated by the present invention to provide a circular sealed beam lamp arrangement that does not utilize a protruding element disposed on the rear sealing surface of the ceiling rim.

Hereinafter, preferred embodiments according to the present invention will be listed.

(1) the prism element has a longitudinally extending rib, and the rim body has a greater thickness in the direction of the longitudinally extending rib than in the transverse direction; A circular pressed glass lens member according to claim 1.

(2) The circular glass lens member according to item 1, wherein the front sealing surfaces of the sealing rim are in the same plane.

(3) The prism element of the lens member has a circular shape, and the prism element has a rib extending in the longitudinal direction, and the thickness of the rim body portion is greater in the direction of the rib extending in the longitudinal direction than in the lateral direction. 3. A pressed glass sealed beam lamp device as claimed in claim 2, which is larger than .

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an improved circular pressed glass lens member according to the present invention. 60: Circular pressed glass lens member, 62: Inner surface, 64, 66, 68: Prism element, 7
0: Outer sealing rim, 72: Front sealing surface, 74: Rear sealing surface, 76: Main body.

Claims (1)

[Claims] 1. A circular pressed glass lens member for a sealed beam lamp, comprising: an inner surface having a prism element including longitudinally extending ribs for focusing transmitted light, and an outer periphery having front and rear sealing surfaces. A pressed glass lens member for a sealed beam lamp device, comprising a partially sealed rim, the rim being thicker at both end portions of the longitudinally extending rib than the rim in a direction transverse to the rib. 2. an inner surface having a prism element including longitudinally extending ribs for focusing transmitted light, and an outer peripheral sealing rim having front and rear sealing surfaces, the thickness of the rim extending in the longitudinal direction; A circular pressed lens member for a sealed beam lamp device, which is thicker than the thickness of the rim in the direction transverse to the rib at both ends of the rib, is attached to the outer peripheral sealing rim of the pressed glass reflective member facing the outer peripheral sealing rim. A circular pressed glass sealed beam lamp device made of a mesh seal.