SELF-ALARMING AIR CLEANER
First Claim
1. An air cleaner comprising:
- an air filter element;
a light emitting element emitting light at the air filter element, the light emitted from the light emitting element being reflected or transmitted by the air filter element to form an area of light attenuation;
a light sensor sensing a light level within the area of light attenuation; and
an electric circuit having an alarming device and connected with the light sensor, the circuit enabling the alarming device upon sensing of a predetermined light level within the area of light attenuation by the light sensor.
0 Assignments
0 Petitions
Accused Products
Abstract
A self-alarming air cleaner is disclosed. The air cleaner includes an air filter element (1), a light emitting element (2) and a light sensor (3). The light emitting element (2) and the light sensor (3) are both faced to the air filter element (1). The light emitted from the light emitting element (2) is reflected by the air filter element (1) or permeated to the air filter element (1), then forms an area of light attenuation where the light sensor (3) is located. The light emitting element (2) and the light sensor (3) connect with a circuit which has an alarming device. When much dust is accumulated on the air filter element (1), the intensity of the light reaching the light sensor (3) is weakened and the alarming device (4) can give an alarm automatically.
-
Citations
20 Claims
-
1. An air cleaner comprising:
-
an air filter element; a light emitting element emitting light at the air filter element, the light emitted from the light emitting element being reflected or transmitted by the air filter element to form an area of light attenuation; a light sensor sensing a light level within the area of light attenuation; and an electric circuit having an alarming device and connected with the light sensor, the circuit enabling the alarming device upon sensing of a predetermined light level within the area of light attenuation by the light sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. In combination, a first light emitter, an air filter, a light sensing circuit, and a second light emitter;
- wherein
said light sensing circuit is arranged to sense light emitted from said first light emitter and reflected off or transmitted through said air filter; said light sensing circuit is arranged to distinguish between a non-dusty light level and a dusty light level; said light sensing circuit is arranged to enable said second light emitter only when said dusty light level is sensed; and said filter is arranged to reflect or transmit light emitted from said first light emitter at said non-dusty light level when said filter is non-dusty, and to reflect or transmit light emitted from said first light emitter at said dusty light level when said filter is dusty. - View Dependent Claims (14, 15, 16, 17, 18, 19)
- wherein
-
20. And air cleaning apparatus comprising:
-
a housing; an air filter disposed within said housing; a motorized blower disposed within said housing and arranged to draw dusty air into said air filter where the dusty air is converted to non-dusty air, and to exhaust said non-dusty air from said housing; a first light emitter disposed adjacent said air filter and arranged to emit light there-at; a light sensor disposed adjacent said air filter and arranged to sense said emitted light after reflection thereof off or transmission thereof through said filter; an electric circuit connected to said light sensor and adapted to distinguish between a non-dusty light level sensed by said light sensor and a dusty light level sensed by said light sensor, a second light emitter connected to said electric circuit and enabled thereby only when said circuit distinguishes a dusty light level;
whereinsaid air filter is adapted to reflect or transmit light from said first light emitter at said non-dusty light level when said filter is non-dusty and to reflect or transmit light from said first light emitter at or below said dusty light level when said filter is dusty.
-
Specification