DE2535187C2 - Bearing arrangement for at least one piezoelectric crystal of a piezoelectric ignition device, preferably for photographic cameras - Google Patents

Description

The invention relates to a storage arrangement for at least one piezoelectric crystal of a piezoelectric ignition device which, when applied, generates a voltage surge and for ignition of flash lamps is provided in a photographic camera and in which the or the piezoelectric crystals in a tubular insulating body are stored and on both sides of the crystal or the Crystals each have an anvil. wherein the crystals have a cylindrical shape, the free interior space of the tubular insulating body in which the Crystals are arranged that has the cross section of the crystals. a forts / of the anvil to be loaded in «An extension of the insulating body having the same cross section engages and an extension of the does not acting anvil protrudes into the opening of the insulating body.

An arrangement of this type is known from DE-OS 20 19 928. The orientation is the Crystals and anvils from the dimensional accuracy of these parts and the insulating piece surrounding them on the one hand ynd the dimensional accuracy of the insulating piece and the carrier on the other hand dependent. A self-employed The anvils are not aligned in the carrier.

In contrast, the invention is based on the object of providing an arrangement of the type mentioned at the beginning to create a good alignment of the to the without great dimensional accuracy of the parts to be used Ignition / u acting parts and therefore a large central one with relatively low impact energy Surface pressure to achieve a relatively large tension is achieved.

This task is solved by the teaching of

Main claim. Further refinements of the invention can be found in the subclaims.

An embodiment according to the invention is explained in more detail using a drawing. The only figure shows a section through an inventive Storage for two piezoelectric crystals.

In the figure, 1 shows a carrier with a U-shaped cross section, which is attached to the two end faces Recesses I; i and 16 and one in the connecting web

ι »has recess. Two piezoelectric crystals 2 are in a tubular insulating body 6, the Inner cross-section is rectangular, and touch with their inner end faces 2a a conductor 8, which is through a Opening 6a in the insulating body 6 and through the

ι ■ recess Ic is led to the outside and can be brought into conductive connection during or after the installation of the entire arrangement in a photographic camera with the flash lamp to be ignited in each case. Two tabs 66 of the insulating body

■? » pers 6 protrude to secure the position of the insulator 6 in Carrier 1 and to facilitate a positionally correct attachment of the arrangement in the camera in which it is to be installed, also through the recess Ic of the Carrier I.

The rectangular recess of the insulating body 6, in which the piezoelectric crystals 2 are located, has an enlargement 6c of circular cross section at one end. On the front surface 2b of the corresponding crystal 2 are a damping plate 7 from

ti · diameter of the enlargement 6c and on the damping plate 7 on the end face of an anvil 3. The outer end of the anvil 3 with the end face 3a is conical and protrudes under the action of a on the corresponding end face of the carrier 1 and

»■> an extension 3b supporting compression spring 5 by the

Recess ta outwards, so that the end face 3a

acted upon by a bat on the camera side can be.

On the other side of the arrangement is an anvil 4

· "Is provided, which engages with an extension 4b in the rectangular recess of the insulator 6 and is designed as an end face 4a of a ball towards the recess \ b . This end face 4a lies in the recess ib.

«The advantage of this storage for piezoelectric Crystals 2 for igniting flash lamps is that the crystals 2 and the anvils 3, 4 are also centric are stored to each other, if the as a simple Stan / or bent part produced beam 1 is not very accurate

Ίο is worked and its two end faces are not arranged exactly parallel to one another, for example, or the two recesses la. 16 not exactly aligned. A particularly simple assembly of the crystals 2 in the carrier 1 can also be achieved in this way.

> 'So either the anvil 3 and the Flaps 66 are inserted through the recess la or Ic and then with the temporary compression of the compression spring 5, the parts 6 and 4 in the Carrier I be pivoted into it, so that when

^b0 relaxation of the compression spring 5, the end face 4a latches with the recess 1ö and crystals 2 and anvils 3, 4 align with one another at the same time. Another mounting option is that an end face of the carrier 1 only after the insertion of the insulating body

"· Pers 6 including the crystals 2 and anvils 3, 4 is bent down, even with larger tolerances when bending through the end face 4a a good centering is achieved.

Bet someone else; not for the sake of tier EiniaehU-ii Embodiment shown, the carrier I can be designed as a pot that is only down for inserting the Insulating body 6 and the other parts 2 to 4 is open.

When generating a kinetic Encigie at the als Face formed face 3a of the anvil 3 creates a sound and pressure wave that causes the goes through the entire structure. This creates a sinusoidal voltage in the form of a in the piezo crystals 2 Half-wave over the conductor 8, on which the piezocrystals rest with their end faces 2a abc '"üh; i" errs and to ignite a suitable Flash lamp can serve.

In order to achieve a certain Laufzeil of the sinusoidal signal is arranged, the damping plate 7 between the front anvil 3 and the front face Ib.

2. Luge * disorder according to claim 1, characterized in that a damping device (V) is provided between the zv acting anvil (3) and that surface (£ ■ * '/ di »then subsequent crystal (2)

3. Bearing arrangement according to one of the preceding claims, characterized in that the anvil (3) to be acted upon has an extension (3ft, JaiifWEIS and a compression spring (5) between the extension (3b) and the associated recess (Ia ^ having tavern? Des The carrier (1) is clamped.

4. Bearing arrangement according to one of the preceding claims, characterized in that the insulating body (6) has at least one tab {6b) which engages in a further recess (Ic) of the carrier (1) to secure it in position.

1 sheet of drawings

Claims (1)

Patent claims: I. Bearing arrangement for at least one piezoelectric crystal of a piezoelectric ignition device, which generates a voltage surge when applied and is preferably provided for igniting flash lamps in a photographic camera and in which the crystal or crystals are stored in a tubular insulating body and on both sides of the crystal or The piezoelectric crystals each have an anvil ", the crystals (2) having a cylindrical shape, the free interior space of the tubular insulating body (6) in which the crystals (2) are arranged has the cross-section of the crystals (2) Extension {3b) of the anvil (3) to be acted upon engages in an extension (6c) of the insulating body (6) having the same cross section and an extension of the anvil (4) which is not to be acted upon protrudes into the opening of the insulating body, characterized in that the anvils (3, 4) under the action of a spring into aligned recesses (\ a, \ b) of a carrier (1) engage and the end face (4a,) of the anvil (4) lying opposite the anvil (3) to be fired is designed as part of a spherical surface in the associated recess [Ib) and that the extension (4b) of the not to be acted upon is designed as a square anvil (4).