Radiation receiver

IPC classes for russian patent Radiation receiver (RU 2371810):

H01L31/0224 -

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Radiation receiver / 2371810

Radiation receiver has a case made from ceramic material with an input window sealed to it. Inside the case on a metal-coated bottom, there is a crystal with photosensitive elements, connected to a contact pad. The contact pad is made in the wall of the case in form of a metal-coated step, and electrical leads, passing through the ceramic case, are in form of conductor strips.

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FIELD: physics.

SUBSTANCE: radiation receiver has a case made from ceramic material with an input window sealed to it. Inside the case on a metal-coated bottom, there is a crystal with photosensitive elements, connected to a contact pad. The contact pad is made in the wall of the case in form of a metal-coated step, and electrical leads, passing through the ceramic case, are in form of conductor strips.

EFFECT: increased strength of the structure of the radiation receiver, increased reliability during operation.

3 cl, 1 dwg

The invention relates to a photosensitive semiconductor devices, particularly, to detectors containing housed in a hermetically sealed casing of the crystal with photosensitive elements and intended for use in, for example, gyroscopes, accelerometers, and other devices with the system of spatial orientation.

The known radiation detector containing photodiode, placed in glass-to-metal cylindrical housing with inputs (see Photodiode quantum-1, the prospectus of the company JSC "CCB "Rhythm", Chernovtsy, 2008, http://ckb-rhythm.narod.ru/fdSipn_fdkvantl.htm). This structure contains several glass-to-metal joints and conclusions high demands on tightness and impact resistance. This complicates the manufacturing process of the device and reduces its reliability.

Known closest to the technical nature of the radiation detector containing a cylindrical housing, an input box and base, forming a sealed cavity in which the base, equipped with glass-to-metal electrical connection attached to the crystal with the photosensitive element (PSEs) (see W. Applied physics, 2001, No. 6, p.66-112). In this design there are also glass-to-metal joints and conclusions, the production of which in the manufacture of the device requires high quality is and the materials skilled workers and technological control, even when their availability cannot be guaranteed no leaks within the specified lifetime of the radiation receiver.

The problem solved by the invention is to improve the structural strength of the radiation receiver. The technical result when it is used is to increase the reliability in operation.

This technical result is achieved due to the fact that the radiation receiver, comprising a housing with hermetically attached to the input box and placed inside the crystal with a photosensitive element connected to the contact pad and provided with electrical connection according to the invention the casing is made of a ceramic material, the bottom of the housing is metallized, it fixed the crystal with the photosensitive element, the contact pad is made in the form of metallized stairs in the wall of the housing, and electrical leads passing through the thickness of the ceramic body made in the form of conductive tracks. In particular cases as the ceramic material can be used ceramics VK 94-1, as the case may be cylindrical.

New in the present invention are the embodiment of the casing of the receiver, ceramic, metallisierung the e inside the bottom of the housing, the presence of pad in the form of metallic stairs in the wall of the casing and passing through the thickness of the ceramic bottom of the housing electrical leads in the form of conductive tracks. This construction of the body together with the conductive tracks can be manufactured in a single technological cycle. And through the thickness of the ceramic material can be the formation of conductive tracks of any configuration with access to any point of the outer surface of the shell, and not strictly perpendicular, as in the use of inputs in the prototype. This provides additional opportunities when designing receivers.

The ceramic material provides a solid case design, this lack of connection joints between the walls and bottom of the housing and inputs can increase the reliability of operation of the device, primarily by increasing the shock resistance of the device.

In particular, if you run as a ceramic material selected ceramics VK 94-1, as it is the most appropriate for the parameters of technology, vacuum density, coefficient of thermal expansion (CTE) and others Also use ceramics reduces the weight of the receiver due to its lower density, which reduces the load process use the AI as elements of the structure, and mounting hardware.

The metallization of the bottom of the housing is necessary to ensure electrical contact of the crystal with electrically conductive track and at the same time for best mounting method soldering using eutectic solder.

Case it is advisable to perform cylindrical, as this allows you to center the product relative to the footprint of the equipment.

The invention is illustrated in the drawing, which shows a diagram of the proposed design of the radiation receiver.

The proposed design contains made of a ceramic material of the housing 1 and the input window 2, is sealed in the housing 1. The bottom 3 of the housing is metallized on the inside, it fixed crystal 4 with a photosensitive element connected to the contact pad, made in the wall of the housing in the form of metallized step 5. The bottom 3 of the housing and the contact pad 5 is connected to the pins 7 of the radiation receiver electrical pins 6 passing through the thickness of the ceramic bottom of the housing in the form of conductive tracks. In the sealed cavity of the housing is drained, the air in the atmosphere which provided conditions for stable PSEs: no leakage and corrosion compounds. The housing 1 may be made cylindrical.

The proposed design is tion of the radiation detector used in the systems orientation of different devices, in the process, which are the linear and angular displacement about the axis. As a result, the receiver experiences a high mechanical loads, which can lead to leaks and the intake device of moisture, which degrades its electrophysical parameters. Reducing weight and the number of connecting joints greatly reduces the likelihood of leaks in the device and thus increases the reliability of its performance during service life.

The proposed design can be implemented, for example, for Si photodiodes with a range of spectral sensitivity of 0.5-1.06 µm. In the manufacture of ceramic shell applies a well-established, cost-effective technology for the production of a multilayer ceramic circuit Board using a screen printing: multiple lamellar strips of ceramic material VK 94-1 thickness of 0.2 mm to form the housing with contact pads and conductive paths of metallization pastes the specified configuration and geometrical dimensions, which burn. Then carry out the plating of the bottom of the housing, the contact step and the point where they exit from the housing, the conductive tracks to which external leads are soldered, and the metallic bottom of the housing is soldering with the use of eutectic solders crystal with PSEs and the th connection wire with the contact pad of the housing. Then in special boxes with dried air tightly glued glass input window. Collected in this way the design has increased in relation to the prototype mechanical strength with significant congestion in the apparatus, thus reducing the likelihood of leaks in the radiation detector that provides the persistence parameters of the receiver and improves the reliability of his work.

1. A radiation receiver that contains made of a ceramic material housing with hermetically attached to the input window, inside the case on the metallized bottom pinned crystal of the photosensitive elements connected to the contact pad, made in the wall of the housing in the form of metallic steps, and electrical leads passing through the thickness of the ceramic body made in the form of conductive tracks.

2. The radiation detector according to claim 1, characterized in that the ceramic material used ceramics VK 94-1.

3. The radiation detector according to claim 1 or 2, characterized in that the housing is cylindrical.