FR2771254A1 - Circuit board display control mechanism - Google Patents

Abstract

The mask gives a direct comparison between the actual and expected circuit giving good recognition of missing components.

Description

The present invention relates to a scale 1 image projection apparatus making it possible to visually check the presence or absence of a component on an electronic circuit (in particular wired printed circuit).

An openwork mask at the precise location of the components to be observed is positioned on the projected image.

A change of objective makes it possible to obtain a magnification X which will make it possible to reposition a missing component.

Traditionally the control is carried out by systems using video cameras or even practiced with the naked eye in certain companies.

As the size of the components is often very small, detection is often difficult.

The objective of the present invention is therefore to propose a solution to this problem:
The machine consists of a frame (1) made of folded sheet metal.

A printed circuit (or other) is positioned on a plate (2). With the help of lighting (3), the image of the room is projected onto a mirror (4) which returns it to an optical group (5) (lens prism lens) which itself reviews this image by making a 90 degree angle on another mirror (6) which reflects the image on a frosted glass (7) .On one side of the frosted glass the user will have previously slipped a mask (8) (metallic, film or other)
openwork only where the components to be observed are reflected.

Finally, the user will only see on the frosted glass a dark surface provided with openings in which the user can observe all or part of the components of a wired or other printed circuit.

 It is understood that this invention mainly intended for the electronic industry can be used for the observation of any product other than those for which it was designed.

FIG. 1 shows a side view of the present invention:
The machine consists of a frame (1) made of folded sheet metal on which is fixed a supply device distributing electrical energy to a fan, to the lighting device (3) consisting of a bulb for supplying optical fibers (evenly distributed on both sides of the frame).

The optical fibers are placed on ball joints (10) which are fixed to the frame.

This configuration allows adjustable lighting.

The image of the card is reflected on the mirror (4) mechanically fixed on the frame. This mirror returns the image to the optical group (5) (consisting of two groups of lenses and a prism. The groups of lenses are placed at 90 degrees to each other. The prism is located in the middle ). This group has
for functions of focusing the image and sending it back to the mirror (6)
(fixed on the frame) in such a way that the user perceives the image from the right side.

 The two mirrors are placed at 90 degrees to each other.

The last mirror returns the image on a frosted glass (7) Between the frame and the glass
the user slides an openwork mask (8) at the location of the components to be checked. The frosted glass and the mask are fixed to the frame by a system of clamps (9).

Details:
1) different magnifications can equip this machine, depending on the precision required for repairs.

 N 2) the optical group (5) (lentilleso prisme lentilles) enables the image to be focused, inverted and returned. It can be adjustable in order to obtain good clarity of the parts to be observed.

3) The openwork mask (8) can be:
A metal sheet, PVC, cardboard. Chemically etched, by laser,
punched, pierced ...

  A negative photo film in which the openings are left transparent corresponding to the locations of the components to be observed.

4) On the mask (8) that the user will slide against the frosted glass (7), can appear in addition to the openings, all kinds of annotations (notebook
loads, notes, marks to check the polarity of certain components, or the feeling of certain parts), we can also (if we use a film), apply a translucent color on certain openings in order to dissociate certain elements to be checked.

Figure 2) shows a front view of the invention.

As an example, the distances to the center of the field of vision are:
circuit 4 center of the mirror (4): 346 mm.
mirror (4) prism of the optical group (5) of magnification 1: 150 mm.
prism of the optical group (5) <center of the mirror (6) 170 mm.
mirror (6) 4 center of frosted glass (7): 326 mm.

The two mirrors (4) and (6) are fixed to the frame (1) by means of a rectified aluminum plate which serves as a reference plane. These two mirrors (4) and (6) are inclined at 45 degrees relative to the horizontal
The focal lengths of the two lens groups of the optical group (5) are fl = 2 = 251 mm.

Claims (3)

 prints.  the other, with a frosted glass (7) against which a mask (8) is placed 2) Device according to claim 1) characterized in the projection of an image on a 1/1 scale on a frosted glass (7) for the observation of the circuits  optics (5) of mirrors (4) and (6) arranged at 90 degrees relative to  ball joints fixed on the frame (1) to adjust the lighting), of a group  distributed along both sides of the frame (these fibers are placed on  composed of a bulb supplying optical fibers uniformly  consisting of a frame (1) on which is fixed a tray (2), lighting (3)  components on a wired printed circuit, characterized in that it is  Claims 1) Apparatus for visually checking the presence of 3) Device according to claim 1) characterized in that an openwork mask  (8) allows, when placed against the frosted glass (7), to see only  certain specific areas.