Television – Camera – system and detail – Support or housing
Patent
1995-01-09
1996-09-24
Garber, Wendy
Television
Camera, system and detail
Support or housing
348335, H04N 5225
Patent
active
055595561
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an arrangement for am image scanning unit comprising a semiconductor package so arranged as to generate electrical signals corresponding to an image incident upon the light-sensitive surface of the package and so arranged as to be connected by soldering to a circuit board, an optical system arranged in a holder for projecting the image to be scanned onto the aforementioned light-sensitive surface, a mounting plate positioned between the semiconductor package and the circuit board, and devices for joining together the holder and the mounting plate and for ensuring correct mutual alignment between the semiconductor package and the optical system.
2. Description of the Related Art
An arrangement of this kind is previously disclosed through U.S. Pat. No. 4,594,613. The mounting plate is attached in this case to the holder for the optical system by means of screws and pins, which project outwards from the holder and interact with holes in the mounting plate in order to ensure the desired alignment between the semiconductor package and the optical system. The previously disclosed arrangement has a comparatively bulky construction and uses many detail components which demand a relatively long assembly time; in order to be able to fix the holder to the mounting plate with screws, or vice versa, openings are also required in the actual circuit board. Ensuring that the holder is correctly aligned relative to the semiconductor package, as briefly described above, means that the accuracy of the alignment may be jeopardized.
SUMMARY OF THE INVENTION
The object of the present invention is to make available an arrangement of the kind referred to by way of introduction, in which elimination of the above-mentioned disadvantages has been effected and has been made possible in that in order to ensure correct alignment between the optical system and the light-sensitive surface of the semiconductor package in the longitudinal direction of the semiconductor package, the aforementioned devices comprise a projection projecting from the holder in such a way, when the unit is assembled, that it engages between two of the contact legs of the semiconductor package, and that for ensuring correct alignment in the transverse direction of the semiconductor package and in a direction normal to the light-sensitive surface, the aforementioned joining devices comprise snap elements capable of interacting with one another arranged on the holder and on the mounting plate.
A desired alignment accuracy tolerance between the optical system and the light-sensitive surface of the semiconductor package is achieved through the characteristic features of the invention in that the location of the holder is achieved by means of the semiconductor package itself or, rather, with two of its contact legs. In addition, a space-saving, rapid, reliable and simple joint is obtained between the holder and the mounting plate.
In accordance with one particular characteristic of the invention, the snap elements in one preferred embodiment are arranged along two lines running parallel to one another and to the longitudinal edges of the semiconductor package and lying in areas close to them.
BRIEF DESCRIPTION OF THE DRAWING
The invention is described in greater detail below with reference to the accompanying drawing, in which FIG. 1 illustrates an exploded view of the invention in perspective view. FIG. 2ashows the arrangement in accordance with the invention installed, and FIG. 2b is a detailed view showing a projection which ensures correct alignment between the light-sensitive surface of a semiconductor package and an optical system, by means of which an image is projected onto the aforementioned surface. FIG. 3a shows the arrangement in accordance with the invention shown in FIG. 2a in side view, and FIG. 3b is an enlarged partial view of FIG. 3a, which shows snap elements by means of which a holder for the optical system is fixed to a mounting plate for the holder.
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REFERENCES:
patent: 4594613 (1986-06-01), Shinbori et al.
patent: 4803557 (1989-02-01), Bridges
patent: 5153734 (1992-10-01), Kanamon et al.
patent: 5274456 (1993-12-01), Izumi et al.
patent: 5444485 (1995-08-01), Uchioke et al.
Garber Wendy
ICL Systems AB
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