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We study (1 + 2v)-constacyclic codes overR + vR and their Gray images, where v2 + v = 0 and R is a finite chain ring with maximal ideal <λ> and nilpotency index e. It is proved that the Gray map images of a (1 + 2v)-constacyclic codes of length n over R + vR are distance-invariant linear cyclic codes of length 2n over R. The generator polynomials of this kind of codes for length n are determined, where n is relatively prime to p, p is the character of the field R/<λ> . Their dual codes are also discussed

A Class of Constacyclic Codes over &lt;i&gt;R&lt;/i&gt; + &lt;i&gt;vR&lt;/i&gt; and Its Gray Image

A Class of Constacyclic Codes over <i>R</i> + <i>vR</i> and Its Gray Image