Watch including a manual control device
First Claim
1. A watch comprising a case constituting ground, a glass and at least one manual control device, which is connected to a processing circuit for executing a predetermined watch function by the action of said manual control device, said manual control device comprising:
- a capacitive sensor comprising a first armature placed on an internal face of the glass such that another armature is selectively formed by the positioning of a finger of a user of said watch on the external face of the glass, said capacitive sensor thereby forming a first capacity, and said watch also having a parasitic second capacity between said first armature and the case,a voltage-frequency converter whose input is connected to a common junction between said first armature and said second capacity,and a frequency detector connected between said converter and said processing circuit, so that the oscillation frequency of said converter varies as a function of the presence or absence of the user'"'"'s finger on said external face of the glass.
1 Assignment
0 Petitions
Accused Products
Abstract
This watch (1) includes a case (2), a glass (3) and at least one manual control device (22), which comprises a capacitive sensor (20) with a first electrode (5) arranged on the internal face (6) of the glass (3). The selective positioning of a finger (10) of a wearer of the watch (1) on the external face of the glass (3) enables a first capacity (Cd) to be formed between the first electrode (5) and earth (11) constituted by the case (2). A parasitic capacity (Cp) is present between the first electrode and the case.
The manual control device (22) also includes a voltage-frequency converter (22) whose oscillation frequency is determined by the first capacity (Cd), when the latter is formed by the presence of the finger, in combination with the parasitic capacity (Cp),
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Citations
9 Claims
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1. A watch comprising a case constituting ground, a glass and at least one manual control device, which is connected to a processing circuit for executing a predetermined watch function by the action of said manual control device, said manual control device comprising:
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a capacitive sensor comprising a first armature placed on an internal face of the glass such that another armature is selectively formed by the positioning of a finger of a user of said watch on the external face of the glass, said capacitive sensor thereby forming a first capacity, and said watch also having a parasitic second capacity between said first armature and the case, a voltage-frequency converter whose input is connected to a common junction between said first armature and said second capacity, and a frequency detector connected between said converter and said processing circuit, so that the oscillation frequency of said converter varies as a function of the presence or absence of the user'"'"'s finger on said external face of the glass. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification