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US 4,359,277 AGranted
Camera with printed circuit boards comprising resistance-conductor laminated constructions
AssigneeCanon Kabushiki Kaisha
InventorsMasami Shimizu, Junji Omi, Kunio Watanabe, Masanori Uchidoi, Hiroshi Aizawa
Life of this patent
Estimating the term…
Abstract
The present invention relates to a camera with the main circuit boards and the sub-circuit boards comprising electrical circuit constructions having resistance-conductor laminated constructions so designed that the insulating support on which a resistance material layer and a conductor material layer are laminated are processed by means of selective etching. This is done in such a manner that the resistance members are constituted with the resistance material layer while the conductor parts such as wiring, terminals and so on are constituted with the conductor material layer.
Claims21
An electrical circuit construction for a camera of the type having an exposure control mechanism and an optical means having a flat, non-functional surface, the construction comprising:
- a resistor-conductor laminated electrical circuit arrangement which includes at least one main circuit board which is flatly shaped and forming an essential part of the electrical circuitry positioned on the non-functional surface, and a sub-circuit board for forming a variable electrical circuit element cooperating with an exposure value setting mechanism of the camera, said main circuit and sub-circuit boards being connected to each other by means of flexible printed wiring boards;
- each main circuit board and said sub-circuit board being a lamination of multi-layers laminated on an insulating baseboard and which layers are arranged in the order of, first, a resistor layer and, then, a conductor layer;
- the main circuit board being provided with circuit patterns which are formed by the resistor layer and a combination of the conductor and resistor layers and are to be put on said non-functional surface, said resistor layer being arranged to form resistor elements, laminated parts consisting of the combination of the conductor and resistor layers being used to form conductive parts such as wiring and terminals;
- the main circuit board having a conductive patterned circuit layer on the opposite side of the combination of the conductor and resistor layer, the circuit layer being electrically connected to said conductive parts through the insulating baseboard;
- the conductive patterned circuit layer comprising a terminal pattern, to which semiconductor integrated circuit elements are to be connected, which constitutes said essential part of the electrical circuitry mounted on said main circuit board, each terminal of the integrated circuit elements being soldered and secured directly to the corresponding terminal of the pattern of said conductive patterned circuit layer;
- and
- at least one semi-fixed adjustable resistor being provided at said resistor element formed by said resistor layer of said main circuit board for the purpose of adjusting the resistance value of said resistor element, said resistor having an adjustable member, by which the resistance of the resistor is adjustable, being extended through a hole of said insulating baseboard so as to be adjusted.
4 more elements
In a method of making an electrical circuit arrangement which has an even surface, comprising the steps of:
- providing a circuit board which comprises an insulating baseboard resistor layer deposited on the baseboard and conductor layer deposited on the resistor layer;
- forming a concave portion by removing the unnecessary portion of the laminated combination of the conductor layer and resistor layer;
- and
- filling an insulating material into said concave portion and making an even surface between the conductor layer and the insulating material;
- and
- forming a circuit pattern by selectively removing the conductor layer.
3 more elements
An electrical component for a variable resistor comprising:
- (a) an insulating baseboard member;
- (b) a number of fixed electrodes juxtaposed to each other with a predetermined pattern relation, on which a brush slide is selectively movable;
- and
- (c) a resistor layer deposited on said baseboard member, the resistive layer having a predetermined shape for forming a plurality of resistance elements juxtaposed at both sides of said fixed electrodes and connected to said fixed electrodes in a manner such that each two successive electrodes are connected to one resistance element on one side and one on the other side.
1 more element
An electrical component for a variable or semi-fixed resistor comprising:
- (a) an insulating baseboard member;
- (b) a resistor layer provided on the board member;
- (c) juxtaposed fixed electrodes provided on the resistor layer, each electrode having a meandering portion deposited on the resistor layer outside an electrode portion, each of which is juxtaposed in parallel;
- and
- (d) a part of each meandering portion being removed so as to form a resistance element, which is adapted to be used for the variable or semi-fixed resistor.
2 more elements
An electrical component comprising:
- (a) a baseboard member of electrically insulating material;
- (b) a number n of juxtaposed resistor elements of electrically resistive material positioned on the board member, where n is a positive integer not less than two, each element having a predetermined resistance value and connected to each other in parallel;
- and
- (c) each of a selective number k of the resistor elements having a partially resistive material removed portion for stepwisely obtaining the combined resistance value of the resistor elements in parallel.
1 more element
An electrical component for an integrated circuit assembly comprising:
- (a) an insulating base substrate;
- (b) a first printed circuit having a predetermined circuit pattern comprising a plurality of resistors and conductors, each resistor being formed by removing the following (1) layer partially and (2) layer and conductor being formed by partially removing the following (1), (2) layers:
- where layer (1) and (2) are
- (1) a first resistor layer deposited on a surface of the substrate;
- and
- (2) a first conductive layer deposited on the resistor layer;
- (c) a second printed circuit having a predetermined circuit pattern comprising a plurality of resistors and conductors having terminal conductors to be connected to an integrated circuit unit, each resistor being formed by removing the following (3) layer partially and (4) layer and the conductor being formed by partially removing the following (3), (4) layers:
- where layers (3) and (4) are
- (3) a second resistor layer deposited on the other surface of the substrate;
- and
- (4) a second conductive layer deposited on the second resistive layer;
- (d) said resistor comprising an adjustable or semi-fixed resistor provided on the substrate;
- and
- (e) connector means arranged to be positioned in the baseboard for electrically connecting between the conductor of the first printed circuit and the conductor of the second printed circuit.
11 more elements
A variable resistor comprising:
- (a) a hard baseboard;
- (b) a resistor layer deposited on the baseboard;
- (c) a conductive layer deposited on the resistor layer;
- (d) a number of resistor portions formed by removing corresponding parts of the conductive layer based on a predetermined pattern to be formed by the resistor portions and a number of recesses to be formed by removing at least a part of the conductive layer and the resistor layer, a part of the remaining conductive layer being arranged to form a number of fixed electrodes, each two successive electrodes having one of said recesses therebetween;
- and
- (e) a sliding contact for sliding on the electrodes and engaging with the recess formed by the juxtaposed electrodes so as to cause a click action by the recess.
3 more elements
A circuit board adapted for a printed circuit comprising:
- (a) a first circuit board having a surface on which the printed circuit is to be formed;
- (b) a second circuit board having a surface on which the other printed circuit is to be formed;
- (c) a connecting part for connecting the first circuit board with the second circuit board in a predetermined positional relation;
- and
- (d) the connecting part having an alignment recess for aligning a sub-connecting board which has a connecting wire terminal so as to connect electrically between the printed circuits on the first circuit board and the second circuit board, with the first and second circuit boards in a manner that the terminal of the sub-connecting board is positioned at the corresponding counterpart of the printed circuits on the first and second circuit boards.
2 more elements
A method for connecting electrically between two circuit boards comprising the following steps:
- (a) providing a circuit board having a first circuit board portion, a second circuit board portion and a connecting portion connecting both board portions in one body, the connecting portion having a positional alignment part;
- (b) providing a connecting board which has a terminal wiring for connecting between the circuits to be formed on the first and second board portions, the connecting board having a corresponding positional alignment part to the alignment part of the connecting portion;
- (c) aligning the connecting board in relation to the circuit board by each alignment part provided at the connecting board and the circuit board respectively;
- (d) connecting electrically between the wiring terminal and the circuit on the first and second boards;
- and
- (e) removing the connecting portion.
3 more elements
Dependencies are inferred from the claim text.